Nutritional Information
Each 2 tablets typically provide:
Per Portion NRV*
- Vitamin A - 800µg RE - (100% NRV*)
- Vitamin D3 - 25µg - (500% NRV*)
- Vitamin E - 12mg a-TE - (100% NRV*)
- Vitamin K2 - 75µg - (100% NRV*)
- Vitamin C - 80mg - (100% NRV*)
- Vitamin B1 - 1.1mg - (100% NRV*)
- Vitamin B2 - 2.8mg - (200% NRV*)
- Vitamin B3 - 16mg NE - (100% NRV*)
- Vitamin B6 - 2.1mg - (150% NRV*)
- Folic Acid - 400µg - (200% NRV*)
- Vitamin B12 - 25µg - (1000% NRV*)
- Biotin - 50µg - (100% NRV*)
- Vitamin B5 - 6mg - (100% NRV*)
- Calcium - 468mg - (58.5% NRV*)
- Phosphorus - 80mg - (6% NRV*)
- Magnesium - 187.5mg - (50% NRV*)
- Iron - 14mg - (100% NRV*)
- Zinc - 15mg - (150% NRV*)
- Copper - 1mg - (100% NRV*)
- Manganese - 2mg - (100% NRV*)
- Selenium - 60µg - (109% NRV*)
- Chromium - 20µg - (50% NRV*)
- Molybdenum - 25µg - (50% NRV*)
- Iodine - 150µg - (100% NRV*)
*NRV=Nutrient Reference Value
Ingredients:
Bulking Agent: Microcystalline Cellulose, Calcium Carbonate, Magnesium Citrate Buffered, Calcium Citrate, Dicalcium Phosphate, Vitamin C (Ascorbic Acid), Flow Agent: Magnesium Stearate, Zinc Citrate, Iron (Ferrous Fumarate), Vitamin E (Dl Alpha Tocopherol Acetate), Silicon Dioxide, Niacin (Nicotinamide), Molybdenum (Sodium Molybdate), Selenium (L-Seleno Methionine), Vitamin D3 Prep (Corn Syrup Solids, Arabic Gum, Medium Chain Triglycerides, Cholecalciferol, Silicon Dioxide, Sodium Ascorbate, Tocopherol Rich Extract), Vitamin A Prep (Retinol Acetate, Corn Vegetable Oil, Tocopherols, Gum Arabic, Sucrose, Maltodextrin, Sodium Ascorbate, Silicon Dioxide), Manganese Citrate Buffered, Pantothenic Acid (D-Calcium Pantothenic), Vitamin K2 (Menaquinone K7), Riboflavin, Vitamin B6 (Pyridoxine Hydrochloride), Copper Sulphate Anhydrous, Thiamin (Thiamin Hydrochloride), Folic Acid, Potassium Iodine, Chromium Picolinate, Biotin, Vitamin B12 (Cyanocobalamin).
Allergens:
Although rigorous precautions are taken to prevent any cross-contamination, this product is manufactured in a facility that handles allergy-based materials.
Disclaimer:
Always consult your health practitioner before taking nutritional supplements, especially if you are taking medication or are under medical supervision. Not recommended for children, pregnant or lactating women. You should not take supplements as a substitute for a varied balanced diet or healthy lifestyle. Store in a cool dry place, out of reach of children.
How to Use
Take 2 tablets daily with water—ideally with a meal to support better absorption and gentleness on the stomach. You can take both tablets at once or split them across the day, depending on your routine. Avoid exceeding the recommended daily dose.
Not recommended for children, or during pregnancy or breastfeeding unless advised by a healthcare provider.
- Pair with breakfast or lunch to support absorption and avoid nausea
- Stay consistent—daily use brings the best results
- Store in a cool, dry place to preserve freshness
- If you're unsure whether you need this, try our free online health assessment for a personalized recommendation (no subscription needed)
- Remember: supplements work best alongside a varied diet and healthy lifestyle
Shipping
We ship with all major carriers, including PostNord, DAO, GLS, and Bring, offering 1–2 business day delivery.
Orders are prepared and sent out within 24–48 hours.
Cost varies between DKK 39-52.00
Free Delivery on orders above DKK 500
*The delivery days count from the moment the carrier has received our package.
We also deliver throughout Europe using trusted partners like GLS and EcoParcel.
Delivery times vary by destination, between 4-15 business days, but we always send out our packages within 48 hours of receiving your order.
Cost varies by destination between €9-25.
Free Delivery on orders above €60.
*The delivery days count from the moment the carrier has received our package.
We currently do not ship outside of the European Union, however if you would like to place a order, contact us at hello@persona-path.com and we will try to assist you.
Transparency & Sourcing
At PersonaPath, we believe in full transparency and doing things the right way—from how we formulate our supplements to how we treat the planet.
Our mission is to help people live healthier, more balanced lives, while respecting the world we all share.
Our products are manufactured in the UK, Germany, Slovenia and Latvia under strict quality standards and then packaged and prepared locally in Denmark, where we work closely with Fødevarestyrelsen (Danish Veterinary and Food Administration) to ensure everything meets national safety and labelling requirements.
We work exclusively with a BRC AA–certified manufacturer that follows Good Manufacturing Practices (GMP) and full traceability, from raw ingredients to finished product. All of our formulations are developed by a qualified nutritionist and are based strictly on EFSA-approved claims—with no inflated promises, ever.
We're also proud to take an ethical and sustainable approach. We never work with suppliers who test on animals or use harmful harvesting methods.
Sustainability is not a side project—it’s core to how we operate.
✔ All of our packaging is made from biodegradable materials, durable glass or recycled plastic
✔ We offset our shipping-related CO₂ emissions
✔ We’re partnered with Greenspark, supporting projects like:
– Reforestation
– Ocean plastic cleanup
– Carbon removal & kelp planting
– Fresh water access in vulnerable areas
– Supporting honeybee populations
We are proud to offer clean, honest supplements—made with care, backed by science, and delivered with respect for your health and the planet.
Our products are manufactured in the UK, Germany, Slovenia, and Latvia under strict quality standards, then packaged and prepared locally in Denmark.
We’ve also built a transparent ingredient section on our website, where you can explore every detail of what goes into our products — including the exact type of raw material, EFSA-approved health claims, ingredient origin, and documented benefits.
Supporting ingredients are also fully listed and explained — what they are, what they do, and why we include them. You can find this information under Ingredients → Supporting Ingredients, or directly on each product page by clicking on “Ingredients.”
Finally, our packaging materials are sourced from Germany, Poland, the UK, and Denmark, all produced to meet the highest European standards of safety and sustainability.
Giving Back Together
We’ve partnered with Greenspark to give back where it’s needed most — supporting meaningful environmental and social causes around the world. Each month, we dedicate a portion of our monthly revenue to a new project that creates real impact, from restoring forests and protecting marine ecosystems to supporting local communities.
You can always see the current month’s cause featured at the top of our website or on our social media channels. At the end of each month, we share full transparency — including donation receipts, details about the partner organization, and photos from the project locations — so you can see exactly where your support goes.
We’re proud that our community plays an active role in helping us make a difference. Every purchase contributes to something bigger — together, we’re building a healthier planet and a better future.
The Persona
Promise
Discover what makes us different and why our customers trust us.
At Persona we don't use marketing claims.
Every health benefit you see is approved by european authorities and backed by science.
It's how we build trust.
Your immune system is a complex network working quietly to support your body’s natural defenses. Providing it with the right nutrients helps its normal function. We included Vitamins C, D3, Zinc, and Selenium as they contribute to the normal function of the immune system.
- Vitamin C, D3, Zinc, and Selenium contribute to the normal function of the immune system.*
- Selenium contributes to the protection of cells from oxidative stress.*
- Vitamin D contributes to the maintenance of normal muscle function.*
- Vitamin B1, B2, B3, B5, B6, B12, and Iron contribute to normal energy-yielding metabolism and to the reduction of tiredness and fatigue.*
Strong bones and muscles help you move confidently and enjoy daily activities. Calcium, Magnesium, Vitamin D3, and Vitamin K2 work together to support normal skeletal strength and muscle function.
- Calcium, Magnesium, Vitamin D3, and Vitamin K2 contribute to the maintenance of normal bones.*
- Calcium contributes to normal muscle function.*
- Magnesium contributes to normal protein synthesis.*
- Magnesium has a role in the process of cell division.*
Your heart keeps you moving every day, quietly working in the background. Nutrients like Vitamin B1, Iron, Magnesium, and Potassium help maintain normal heart function, oxygen transport, and muscle activity.
- Vitamin B1 contributes to the normal function of the heart.*
- Iron contributes to normal oxygen transport in the blood.*
- Magnesium and Potassium contribute to normal muscle function.* Including the heart
Understanding Bioavailability
Why the form of a vitamin matters as much as the vitamin itself
The Restaurant Example
Imagine ordering salmon at a restaurant. The menu says "salmon", but what arrives could be perfectly grilled, raw, or still wrapped in plastic. Technically all salmon, but only one is actually nourishing.
Vitamins work the same way. A label might say "Vitamin C 1000 mg," but that vitamin could be in a form your body barely absorbs, or one it uses efficiently. The form determines whether your body can actually use what you're taking.
What Is Bioavailability?
Bioavailability is the amount of a nutrient that actually enters your bloodstream and reaches your cells.
If you take 100 mg of a vitamin but only 20 mg gets absorbed, the bioavailability is 20%. The rest passes through unused.
What affects bioavailability:
- The chemical form of the vitamin
- Your individual gut health and genetics
- What you eat alongside the supplement
Common Vitamin Forms Explained
Methylated Vitamins (Active Forms)
Some people struggle to convert standard vitamins into their active, usable forms due to genetic variations. Methylated vitamins skip that step; they're already active.
Example: Methylcobalamin (B12) vs Cyanocobalamin
- Methylcobalamin Active form, immediately usable
- Cyanocobalamin Synthetic, requires conversion (which 40-60% of people struggle with due to MTHFR gene variants)
Common forms: Methylfolate (5-MTHF), methylcobalamin (B12), P-5-P (B6)
Natural vs Synthetic
"Natural" doesn't automatically mean better; it depends on the specific vitamin.
Example: Vitamin E
- Natural (d-alpha-tocopherol): Derived from plants, more biologically active
- Synthetic (dl-alpha-tocopherol): Contains 8 forms, only one your body prefers
Example: Vitamin C
- Ascorbic acid (synthetic) is molecularly identical to natural vitamin C and equally effective
- Liposomal vitamin C: Wrapped in fat bubbles for enhanced absorption and higher blood levels
Fat-Soluble vs Water-Soluble
Fat-soluble vitamins (A, D, E, K) need fat to be absorbed. Taking them with food containing healthy fats significantly improves uptake.
Water-soluble vitamins (B, C) dissolve in water and are absorbed more easily, but excess is excreted quickly, making sustained-release forms sometimes beneficial.
What "Bioavailable" Actually Means on a Label
When we say "bioavailable form," we mean:
- Active forms that don't require conversion (methylated B vitamins)
- Forms with proven absorption backed by scientific research
- Enhanced delivery systems (like liposomal technology)
What it shouldn't mean: vague marketing language without specifics.
Red flags to watch for:
- No specific form listed (just "Vitamin B12" without the type)
- "Proprietary blends" that hide ingredient amounts
- Claims without any absorption data
The Bottom Line
A cheaper supplement with poor bioavailability isn't a bargain. The best supplements aren't about taking more; they're about absorbing what you take.
What to look for:
- Specific forms clearly listed on the label
- Science-backed forms (methylated, chelated, liposomal)
- Transparency about dosages and sources
At Persona, we choose forms based on scientific evidence for absorption, not what's cheapest to manufacture. Because if your body can't use it, what's the point?
References: EFSA scientific opinions on bioavailability; NIH Office of Dietary Supplements; peer-reviewed studies on vitamin absorption and forms (available upon request).
For the essentials your body can’t make — but depends on.
Support What Supports You
24 Vitamins & Minerals
Carefully selected and clinically proven nutrients for overall support
Helps Fill nutritional gaps
Provides 100% daily value of selected essential vitamins and minerals.
Engineered for Absorption
Bioavailable ingredients for better absorption.
Whole body support
Essentials from Vitamin A to Zinc.
More than just Supplements
Bioavailable Nutrients
How to Use:
- Take 2 tablets daily with water.
The Benefits of Vitamin A
Active form
Vitamin A is a fat-soluble vitamin essential for vision, immune function, skin health, and cell differentiation. It exists in two forms: preformed vitamin A (retinol, found in animal products) and provitamin A (beta-carotene, found in colourful fruits and vegetables). Adequate vitamin A supports the body's natural defence systems and the maintenance of healthy skin and mucous membranes.
Key Highlights
- Contributes to the maintenance of normal vision (EFSA approved)
- Supports normal function of the immune system (EFSA approved)
- Contributes to the maintenance of normal skin (EFSA approved)
- Supports the maintenance of normal mucous membranes (EFSA approved)
- Has a role in the process of cell specialisation (EFSA approved)
- Contributes to normal iron metabolism (EFSA approved)
Biochemistry Timeline
Vitamin A is fat-soluble and stored in the liver, so the body maintains reserves. Correcting a deficiency typically takes 2 to 4 weeks with appropriate supplementation. Vision-related improvements (night vision) can occur relatively quickly once levels are restored.
Because vitamin A is stored in the body, there is a greater risk of excess compared to water-soluble vitamins. This is why balanced, moderate supplementation is important, and very high-dose vitamin A should only be taken under medical supervision.
Thyroid Support
Research has explored the relationship between vitamin A and thyroid function. A study by Farhangi et al. (2012, Journal of the American College of Nutrition) found that 25,000 IU of retinol daily for 4 months normalised TSH levels and increased free T3 in participants.
While this was a specific clinical intervention and not a general supplementation recommendation, it highlights vitamin A's role in supporting thyroid hormone metabolism. Ensuring adequate vitamin A intake may support normal thyroid function, particularly in combination with selenium and iodine.
Iron Metabolism
Vitamin A contributes to normal iron metabolism, an EFSA-approved health claim. It helps mobilise iron from storage and supports its incorporation into haemoglobin. This relationship means that vitamin A deficiency can worsen iron deficiency anaemia, even when iron intake is adequate.
For women of reproductive age, who are at higher risk of both vitamin A and iron insufficiency, ensuring adequate intake of both nutrients supports optimal red blood cell formation and energy levels.
Summary
Vitamin A is essential for vision, immune function, skin health, and cell differentiation. It exists as preformed retinol (from animal foods) and provitamin A beta-carotene (from colourful vegetables). EFSA recognises multiple health claims including contributions to normal vision, immune function, skin maintenance, and iron metabolism.
Balanced supplementation is key with vitamin A, as the body stores it in the liver and excess preformed retinol can be harmful. The European upper limit is 3,000 µg RAE per day. For most people, moderate supplementation alongside a varied diet provides optimal support.
FAQs
How much vitamin A do I need?
The recommended daily allowance for women aged 19+ is 700 µg RAE. The European upper limit for preformed retinol is 3,000 µg RAE per day. Beta-carotene from food has no established upper limit as the body self-regulates conversion.
Is vitamin A safe during pregnancy?
Adequate vitamin A is important during pregnancy for fetal development. However, excessive preformed retinol (above 3,000 µg RAE) during pregnancy has been associated with birth defects. Pregnant women should avoid high-dose vitamin A supplements and liver products, and follow their healthcare provider's guidance.
What is the difference between retinol and beta-carotene?
Retinol is preformed vitamin A (active, from animal sources) that the body uses directly. Beta-carotene is a provitamin (from plant sources) that the body converts to retinol as needed. Beta-carotene is safer at higher intakes because the body only converts what it needs.
Can I take too much vitamin A?
Yes, excessive intake of preformed retinol can cause liver toxicity, headaches, and other symptoms. Stay within recommended limits and avoid combining multiple supplements that contain vitamin A without checking total intake.
Are there any interactions with medications?
Vitamin A can interact with retinoid medications (used for skin conditions), some antibiotics, and blood-thinning drugs. Consult your healthcare provider if you take regular medication.
Research
Sianipar EA et al. – Drug design, development and therapy (2026). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/41710586/
NIH ODS — Vitamin A Health Professional Fact Sheet (2025). [Regulatory / Reference]. https://ods.od.nih.gov/factsheets/VitaminA-HealthProfessional/
Azhar M et al. – Neonatology (2025). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/39591949/
Santo ACSDE et al. – Nutrition (Burbank, Los Angeles County, Calif.) (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/38696907/
Lau M et al. – Archives of dermatological research (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/38758222/
Chaudhary V et al. – Biological trace element research (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/38109004/
Kurokawa I et al. – Dermatology and therapy (2023). [Review]. https://pubmed.ncbi.nlm.nih.gov/37338719/
Imdad A et al. - Cochrane Database of Systematic Reviews (2022). [Cochrane Review]. https://pubmed.ncbi.nlm.nih.gov/35266555/
Vlieg-Boerstra B et al. – Allergy (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/34626488/
Miller LJ et al. – Clinical nutrition (Edinburgh, Scotland) (2022). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/36067585/
Imdad A et al. – The Cochrane database of systematic reviews (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/35294044/
Szymański Ł et al. – Cells (2020). [Review]. https://pubmed.ncbi.nlm.nih.gov/33322246/
Bastos Maia et al. — Nutrients (2019). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/31405217/
Church JA et al. – The Lancet. Infectious diseases (2019). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/30712836/
Zinder R et al. – Nutrition in clinical practice : official publication of the American Society for Parenteral and Enteral Nutrition (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/31697447/
Bohn T et al. – The Proceedings of the Nutrition Society (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/30747092/
Huang et al. — J Am Acad Dermatol (2018). [Review]. https://pubmed.ncbi.nlm.nih.gov/29217280/
Huang Z et al. - Nutrients (2018). [Review]. https://pubmed.ncbi.nlm.nih.gov/30400586/
Yakoob MY et al. – Journal of epidemiology and global health (2018). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/30859783/
Bello S et al. – The Cochrane database of systematic reviews (2016). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/27580345/
McCauley et al. — Cochrane Review (2015). [Cochrane systematic review].
EFSA NDA Panel — EFSA Journal (2015). [Regulatory / Scientific Opinion]. Regulatory / Foundational
EFSA Panel - EFSA Journal (2015). [Scientific Opinion]. Safety
Bello S et al. – The Cochrane database of systematic reviews (2014). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/24436005/
Bjelakovic et al. — PLOS ONE (Cochrane-based) (2013). [Meta-analysis / Meta-regression (53 RCTs)]. https://pmc.ncbi.nlm.nih.gov/articles/PMC3765487/
Gilbert — Surv Ophthalmol (2013). [Review]. General
Gilbert C - Community Eye Health (2013). [Review]. https://pubmed.ncbi.nlm.nih.gov/24782580/
Farhangi et al. — J Am Coll Nutr (2012). [RCT].
Rutkowski M et al. – International journal of occupational medicine and environmental health (2012). [Review]. https://pubmed.ncbi.nlm.nih.gov/22528540/
Hovdenak N et al. – European journal of obstetrics, gynecology, and reproductive biology (2012). [Review]. https://pubmed.ncbi.nlm.nih.gov/22771225/
Clagett-Dame & Knutson — Nutrients (2011). [Comprehensive review].
Clagett-Dame M & Knutson D - Critical Reviews in Food Science and Nutrition (2011). [Review]. https://pubmed.ncbi.nlm.nih.gov/21711128/
Mayo-Wilson E et al. – BMJ (Clinical research ed.) (2011). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/21868478/
Bello S et al. – The Cochrane database of systematic reviews (2011). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/21491401/
Sommer A - Journal of Nutrition (2008). [Landmark Review]. https://pubmed.ncbi.nlm.nih.gov/18203906/
Huiming Y et al. – The Cochrane database of systematic reviews (2005). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/16235283/
Genaro Pde S et al. – Nutrition reviews (2004). [Review]. https://pubmed.ncbi.nlm.nih.gov/15080368/
Brown N et al. – Acta paediatrica (Oslo, Norway : 1992) (2004). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/15513568/
Solomons NW et al. – Asia Pacific journal of clinical nutrition (2003). [Review]. https://pubmed.ncbi.nlm.nih.gov/14506004/
D'Souza RM et al. – Journal of tropical pediatrics (2002). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/12022432/
D'Souza RM et al. – Journal of tropical pediatrics (2002). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/12521271/
West et al. — BMJ (Nepal NNIPS-2 trial) (1999). [Cluster RCT (double-blind)]. https://pubmed.ncbi.nlm.nih.gov/10037611/
Wiegand UW et al. – International journal for vitamin and nutrition research. Internationale Zeitschrift fur Vitamin- und Ernahrungsforschung. Journal international de vitaminologie et de nutrition (1998). [Review]. https://pubmed.ncbi.nlm.nih.gov/9857270/
Ward BJ – Drugs & aging (1996). [Review]. https://pubmed.ncbi.nlm.nih.gov/8818585/
van Dam MA – The Nurse practitioner (1989). [Review]. https://pubmed.ncbi.nlm.nih.gov/2671824/
45 studies — Vitamin A
Sianipar EA et al. – Drug design, development and therapy (2026). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/41710586/
NIH ODS — Vitamin A Health Professional Fact Sheet (2025). [Regulatory / Reference]. https://ods.od.nih.gov/factsheets/VitaminA-HealthProfessional/
Azhar M et al. – Neonatology (2025). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/39591949/
Santo ACSDE et al. – Nutrition (Burbank, Los Angeles County, Calif.) (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/38696907/
Lau M et al. – Archives of dermatological research (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/38758222/
Chaudhary V et al. – Biological trace element research (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/38109004/
Kurokawa I et al. – Dermatology and therapy (2023). [Review]. https://pubmed.ncbi.nlm.nih.gov/37338719/
Imdad A et al. - Cochrane Database of Systematic Reviews (2022). [Cochrane Review]. https://pubmed.ncbi.nlm.nih.gov/35266555/
Vlieg-Boerstra B et al. – Allergy (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/34626488/
Miller LJ et al. – Clinical nutrition (Edinburgh, Scotland) (2022). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/36067585/
Imdad A et al. – The Cochrane database of systematic reviews (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/35294044/
Szymański Ł et al. – Cells (2020). [Review]. https://pubmed.ncbi.nlm.nih.gov/33322246/
Bastos Maia et al. — Nutrients (2019). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/31405217/
Church JA et al. – The Lancet. Infectious diseases (2019). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/30712836/
Zinder R et al. – Nutrition in clinical practice : official publication of the American Society for Parenteral and Enteral Nutrition (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/31697447/
Bohn T et al. – The Proceedings of the Nutrition Society (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/30747092/
Huang et al. — J Am Acad Dermatol (2018). [Review]. https://pubmed.ncbi.nlm.nih.gov/29217280/
Huang Z et al. - Nutrients (2018). [Review]. https://pubmed.ncbi.nlm.nih.gov/30400586/
Yakoob MY et al. – Journal of epidemiology and global health (2018). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/30859783/
Bello S et al. – The Cochrane database of systematic reviews (2016). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/27580345/
McCauley et al. — Cochrane Review (2015). [Cochrane systematic review].
EFSA NDA Panel — EFSA Journal (2015). [Regulatory / Scientific Opinion]. Regulatory / Foundational
EFSA Panel - EFSA Journal (2015). [Scientific Opinion]. Safety
Bello S et al. – The Cochrane database of systematic reviews (2014). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/24436005/
Bjelakovic et al. — PLOS ONE (Cochrane-based) (2013). [Meta-analysis / Meta-regression (53 RCTs)]. https://pmc.ncbi.nlm.nih.gov/articles/PMC3765487/
Gilbert — Surv Ophthalmol (2013). [Review]. General
Gilbert C - Community Eye Health (2013). [Review]. https://pubmed.ncbi.nlm.nih.gov/24782580/
Farhangi et al. — J Am Coll Nutr (2012). [RCT].
Rutkowski M et al. – International journal of occupational medicine and environmental health (2012). [Review]. https://pubmed.ncbi.nlm.nih.gov/22528540/
Hovdenak N et al. – European journal of obstetrics, gynecology, and reproductive biology (2012). [Review]. https://pubmed.ncbi.nlm.nih.gov/22771225/
Clagett-Dame & Knutson — Nutrients (2011). [Comprehensive review].
Clagett-Dame M & Knutson D - Critical Reviews in Food Science and Nutrition (2011). [Review]. https://pubmed.ncbi.nlm.nih.gov/21711128/
Mayo-Wilson E et al. – BMJ (Clinical research ed.) (2011). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/21868478/
Bello S et al. – The Cochrane database of systematic reviews (2011). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/21491401/
Sommer A - Journal of Nutrition (2008). [Landmark Review]. https://pubmed.ncbi.nlm.nih.gov/18203906/
Huiming Y et al. – The Cochrane database of systematic reviews (2005). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/16235283/
Genaro Pde S et al. – Nutrition reviews (2004). [Review]. https://pubmed.ncbi.nlm.nih.gov/15080368/
Brown N et al. – Acta paediatrica (Oslo, Norway : 1992) (2004). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/15513568/
Solomons NW et al. – Asia Pacific journal of clinical nutrition (2003). [Review]. https://pubmed.ncbi.nlm.nih.gov/14506004/
D'Souza RM et al. – Journal of tropical pediatrics (2002). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/12022432/
D'Souza RM et al. – Journal of tropical pediatrics (2002). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/12521271/
West et al. — BMJ (Nepal NNIPS-2 trial) (1999). [Cluster RCT (double-blind)]. https://pubmed.ncbi.nlm.nih.gov/10037611/
Wiegand UW et al. – International journal for vitamin and nutrition research. Internationale Zeitschrift fur Vitamin- und Ernahrungsforschung. Journal international de vitaminologie et de nutrition (1998). [Review]. https://pubmed.ncbi.nlm.nih.gov/9857270/
Ward BJ – Drugs & aging (1996). [Review]. https://pubmed.ncbi.nlm.nih.gov/8818585/
van Dam MA – The Nurse practitioner (1989). [Review]. https://pubmed.ncbi.nlm.nih.gov/2671824/
The Benefits of Vitamin D3
Bioactive Form
Vitamin D3 (Cholecalciferol) is often called the "sunshine vitamin" because our bodies produce it when skin is exposed to sunlight. It plays a fundamental role in calcium absorption, bone health, immune function, and mood regulation. For those of us living in Scandinavia and Northern Europe, where sunlight is limited for much of the year, supplementation is widely recommended by Nordic health authorities.
Key Highlights
- Contributes to normal absorption of calcium and phosphorus (EFSA approved)
- Supports the maintenance of normal bones and teeth (EFSA approved)
- Contributes to normal function of the immune system (EFSA approved)
- Supports the maintenance of normal muscle function (EFSA approved)
- Has a role in the process of cell division (EFSA approved)
- Especially important in Nordic countries where sunlight is limited Oct-Mar
Biochemistry Timeline
Vitamin D3 supplementation typically takes 4 to 12 weeks to significantly raise blood levels, depending on your starting point and dosage. The Danish Health Authority recommends measuring 25(OH)D levels to assess status. A level above 50 nmol/L is generally considered sufficient, though some researchers suggest 75 nmol/L as optimal.
Because vitamin D is fat-soluble, it is best absorbed when taken with a meal containing some fat. Unlike water-soluble vitamins, vitamin D is stored in body fat, so consistent daily supplementation is more effective than occasional large doses.
Mood and Seasonal Well-being
Many people in northern countries notice changes in their mood during the darker months. Research suggests that vitamin D plays a role in serotonin production, and low vitamin D levels have been associated with low mood and seasonal affective patterns.
While vitamin D supplementation alone is not a treatment for mood disorders, maintaining adequate levels may help support emotional well-being, particularly during the long Scandinavian winter. Studies among Danish and Nordic populations have confirmed that seasonal vitamin D deficiency is common, with levels reaching their lowest point in March (Danish seasonal study, 2019).
Pregnancy and Early Development
Vitamin D is particularly important during pregnancy. It supports the healthy development of the baby's bones, teeth, and immune system. The Danish Health Authority recommends that all pregnant women supplement with vitamin D.
Adequate maternal vitamin D status has been linked to healthier pregnancy outcomes. EFSA recognises that vitamin D is needed for normal growth and development of bone in children, and contributes to the normal function of the immune system in both mother and child.
Summary
Vitamin D3 (Cholecalciferol) is essential for calcium absorption, bone health, immune function, and muscle maintenance. Living in Denmark and Scandinavia means our bodies cannot produce enough vitamin D from sunlight for roughly half the year, making supplementation a well-supported choice.
Nordic health authorities, including the Danish Fødevarestyrelsen, recommend vitamin D supplementation during the winter months. Consistent daily supplementation of the D3 form is the most effective approach to maintaining adequate levels and supporting overall health throughout the year.
FAQs
How much vitamin D3 should I take?
The Nordic Nutrition Recommendations suggest 10 µg (400 IU) daily for most adults, with higher doses considered for those at risk of deficiency. Your healthcare provider can advise on the right dose based on your blood levels and individual circumstances.
Can I get enough vitamin D from food alone?
It is difficult to obtain sufficient vitamin D from diet alone. The richest food sources include oily fish (salmon, mackerel, herring), egg yolks, and fortified foods. Most people in Nordic countries benefit from supplementation, especially during winter.
Is it possible to take too much vitamin D?
Vitamin D toxicity is rare but possible with very high supplementation over extended periods. It is best to stay within recommended guidelines and have your levels checked if you are taking higher doses. The European upper limit for adults is 100 µg (4,000 IU) per day.
Should I take vitamin D with food?
Yes, vitamin D3 is fat-soluble and is best absorbed when taken alongside a meal containing some dietary fat. Even a small amount of fat (such as that found in nuts, avocado, or olive oil) can improve absorption.
Is vitamin D3 safe during pregnancy?
Yes, vitamin D supplementation is recommended during pregnancy. The Danish Health Authority advises all pregnant women to supplement. Consult your healthcare provider for personalised dosage guidance.
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Jackson RD et al. – The New England journal of medicine (2006). [RCT]. https://pubmed.ncbi.nlm.nih.gov/16481635/
Wallin R et al. – Medicinal research reviews (2001). [Review]. https://pubmed.ncbi.nlm.nih.gov/11410932/
Durlach J et al. – Magnesium research (1994). [Review]. https://pubmed.ncbi.nlm.nih.gov/7786695/
Ruff RL et al. – Neurologic clinics (1988). [Review]. https://pubmed.ncbi.nlm.nih.gov/3065602/
Hathcock JN – Federation proceedings (1985). [Review]. https://pubmed.ncbi.nlm.nih.gov/3881283/
Breslau NA et al. – Metabolism: clinical and experimental (1979). [Review]. https://pubmed.ncbi.nlm.nih.gov/390300/
The Benefits of Vitamin E
Bioavailable form
Vitamin E is a fat-soluble antioxidant that protects cell membranes from oxidative damage. It plays an important role in immune function, skin health, and cellular protection. As a key defender of the body's lipid structures, vitamin E works alongside vitamin C to provide comprehensive antioxidant coverage.
Key Highlights
- Contributes to the protection of cells from oxidative stress (EFSA approved)
- Fat-soluble antioxidant that protects cell membranes
- Works synergistically with vitamin C for comprehensive antioxidant coverage
- May reduce CRP (inflammatory marker) in those with elevated levels
- Supports skin health and barrier function
- No increase in mortality risk at standard supplementation levels
Biochemistry Timeline
Vitamin E is fat-soluble and stored in body fat and the liver, meaning it takes time to build up to optimal levels. Blood levels typically increase within 2 to 4 weeks of supplementation, while anti-inflammatory benefits (CRP reduction) were more pronounced with longer supplementation periods.
For skin-related benefits, consistent supplementation over 8 to 12 weeks is recommended. Vitamin E is best absorbed when taken with a meal containing dietary fat.
Hormonal Health and PCOS
Emerging research suggests that vitamin E may offer benefits for women with polycystic ovary syndrome (PCOS). A study by Karandish et al. (2022, Scientific Reports) found that vitamin E, alone or in combination with omega-3 and magnesium, reduced triglycerides, VLDL, LDL, hs-CRP, and hirsutism in women with PCOS.
These findings suggest that vitamin E may support metabolic and hormonal parameters in PCOS, though more research is needed. It works best as part of a comprehensive approach alongside lifestyle changes, diet, and appropriate medical care.
Menopausal Support
A 2023 review (Barcikowska et al., Nutrients) found that vitamin E may influence several aspects of menopausal health, including hot flashes, vascular health, lipid profiles, and vaginal changes. The review suggested vitamin E as a potential option when hormone replacement therapy (HRT) is contraindicated.
While vitamin E is not a replacement for HRT when clinically indicated, it may offer gentle support for some menopausal symptoms as part of a broader approach to well-being during this transition. Individual responses vary, and medical guidance should be sought for significant symptoms.
Summary
Vitamin E is a fat-soluble antioxidant that protects cell membranes from oxidative damage and works synergistically with vitamin C. It is important for cellular protection, skin health, and may support anti-inflammatory processes, hormonal balance, and menopausal comfort.
Research confirms no mortality risk at standard doses and meaningful CRP reduction in those with elevated inflammation. Vitamin E is best taken with food containing fat, and benefits develop over 4 to 12 weeks of consistent use.
FAQs
How much vitamin E do I need?
The recommended daily intake for adults in the EU is 12 mg (approximately 18 IU) of alpha-tocopherol. The European upper limit for supplementation is 300 mg per day. Most supplements provide 100-400 IU per day.
Can I get enough vitamin E from food?
A diet rich in nuts, seeds, and healthy oils can provide adequate vitamin E for many people. However, those with low-fat diets, absorption issues, or increased antioxidant needs may benefit from supplementation.
Is there a risk of taking too much?
At standard supplementation levels, vitamin E is safe and well-tolerated. Very high doses (above 800 IU/day) have been debated in research but a 2014 meta-analysis found no increase in mortality at doses up to 800 IU/day.
Should I take natural or synthetic vitamin E?
Natural vitamin E (d-alpha-tocopherol) is more bioavailable than synthetic (dl-alpha-tocopherol). When reading labels, look for the "d-" prefix, which indicates the natural form.
Is vitamin E safe during pregnancy?
Vitamin E is important during pregnancy for its antioxidant properties. Standard recommended amounts are considered safe. Consult your healthcare provider for personalised guidance.
Research
Amin AM et al. – Nutrition research (New York, N.Y.) (2026). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/41418497/
Ismail YA et al. – BMC neurology (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/39939901/
Yousefi-Nodeh H et al. – Health care for women international (2024). [RCT]. https://pubmed.ncbi.nlm.nih.gov/36053717/
Malandris K et al. – Journal of gastroenterology and hepatology (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/38627972/
Chee NM et al. – Journal of gastroenterology and hepatology (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/39150005/
Wen H et al. – The Cochrane database of systematic reviews (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/39412049/
Wang Y et al. – Drugs (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/38478331/
Shan et al. — Nutrients (MDPI) (2023). [Umbrella review (32 MAs, 64 outcomes)]. https://www.mdpi.com/2072-6643/15/15/3301
Barcikowska et al. — Nutrients (2023). [Systematic review (16 studies)].
Linus Pauling Institute / NIH - Micronutrient Information Center (2023). [Expert Review]. Safety/Dosing
Vogli S et al. – Nutrients (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/37686767/
Ghasemi S et al. – BMC oral health (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/38042793/
Ni C et al. – Molecular nutrition & food research (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/37726247/
Wang MY et al. – Journal of digestive diseases (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/37503812/
Gu Y et al. – Expert review of gastroenterology & hepatology (2023). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/36689199/
Karandish et al. — Sci Rep (2022). [Meta-analysis (10 RCTs)].
Salmani et al. — Clin Nutr ESPEN (2022). [Systematic review & MA].
Ahmad et al. — Sci Rep (2022). [Systematic review & MA (12 RCTs)].
Feduniw S et al. – Nutrients (2022). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/36615817/
Poonyam P et al. – Asian Pacific journal of cancer prevention : APJCP (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/36172650/
Wang J et al. – Oxidative medicine and cellular longevity (2021). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/34616506/
Ashley S et al. – Nutritional neuroscience (2021). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/31661399/
Vadarlis A et al. – Journal of gastroenterology and hepatology (2021). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/32810309/
Lin M et al. – Clinics and research in hepatology and gastroenterology (2021). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/33272889/
Asbaghi et al. — Scientific Reports (Nature) (2020). [Meta-analysis (26 RCTs)]. https://www.nature.com/articles/s41598-020-73741-6
Asbaghi O et al. - Clinical Nutrition ESPEN (2020). [Meta-Analysis]. https://pubmed.ncbi.nlm.nih.gov/32085897/
Ataei-Almanghadim K et al. – Complementary therapies in medicine (2020). [RCT]. https://pubmed.ncbi.nlm.nih.gov/31987231/
Lewis et al. — Cochrane (2019). [Cochrane systematic review]. https://pubmed.ncbi.nlm.nih.gov/31528965/
Jayedi A et al. – Advances in nutrition (Bethesda, Md.) (2018). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/30239557/
Shatzel JJ et al. – Journal of thrombosis and haemostasis : JTH (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/28182323/
Farina N et al. – The Cochrane database of systematic reviews (2017). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/28128435/
Farina N et al. – The Cochrane database of systematic reviews (2017). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/28418065/
Xu W et al. – Journal of neurology, neurosurgery, and psychiatry (2015). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/26294005/
Abner et al. — Cardiovascular Drugs & Therapy (2014). [Meta-analysis (18 RCTs)]. https://link.springer.com/article/10.1007/s10557-014-6560-7
Rizvi et al. — Int J Prev Med (2014). [Review]. https://pubmed.ncbi.nlm.nih.gov/25489440/
Dysken ME et al. - JAMA (TEAM-AD) (2014). [RCT]. https://pubmed.ncbi.nlm.nih.gov/24381967/
Traber MG - Free Radical Biology and Medicine (2014). [Expert Review]. https://pubmed.ncbi.nlm.nih.gov/24746618/
Gutarra-Vilchez RB et al. – The Cochrane database of systematic reviews (2014). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/25310622/
Lopes da Silva S et al. – Alzheimer's & dementia : the journal of the Alzheimer's Association (2014). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/24144963/
Showell MG et al. – The Cochrane database of systematic reviews (2013). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/23913583/
Farina N et al. – The Cochrane database of systematic reviews (2012). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/23152215/
Biglia N et al. – Climacteric : the journal of the International Menopause Society (2009). [RCT]. https://pubmed.ncbi.nlm.nih.gov/19415540/
Isaac MG et al. – The Cochrane database of systematic reviews (2008). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/18646084/
Bordeleau L et al. – Clinical therapeutics (2007). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/17472816/
Ziaei S et al. – Gynecologic and obstetric investigation (2007). [RCT]. https://pubmed.ncbi.nlm.nih.gov/17664882/
Lee et al. — JAMA Cardiol (2005). [Meta-analysis (19 RCTs)]. https://pubmed.ncbi.nlm.nih.gov/15537682/
Miller ER et al. - Annals of Internal Medicine (2005). [Meta-Analysis]. https://pubmed.ncbi.nlm.nih.gov/15668483/
Chertow B – MedGenMed : Medscape general medicine (2004). [Review]. https://pubmed.ncbi.nlm.nih.gov/15647709/
Heck AM et al. – American journal of health-system pharmacy : AJHP : official journal of the American Society of Health-System Pharmacists (2000). [Review]. https://pubmed.ncbi.nlm.nih.gov/10902065/
Tabet N et al. – The Cochrane database of systematic reviews (2000). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/11034775/
50 studies — Vitamin E
Amin AM et al. – Nutrition research (New York, N.Y.) (2026). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/41418497/
Ismail YA et al. – BMC neurology (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/39939901/
Yousefi-Nodeh H et al. – Health care for women international (2024). [RCT]. https://pubmed.ncbi.nlm.nih.gov/36053717/
Malandris K et al. – Journal of gastroenterology and hepatology (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/38627972/
Chee NM et al. – Journal of gastroenterology and hepatology (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/39150005/
Wen H et al. – The Cochrane database of systematic reviews (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/39412049/
Wang Y et al. – Drugs (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/38478331/
Shan et al. — Nutrients (MDPI) (2023). [Umbrella review (32 MAs, 64 outcomes)]. https://www.mdpi.com/2072-6643/15/15/3301
Barcikowska et al. — Nutrients (2023). [Systematic review (16 studies)].
Linus Pauling Institute / NIH - Micronutrient Information Center (2023). [Expert Review]. Safety/Dosing
Vogli S et al. – Nutrients (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/37686767/
Ghasemi S et al. – BMC oral health (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/38042793/
Ni C et al. – Molecular nutrition & food research (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/37726247/
Wang MY et al. – Journal of digestive diseases (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/37503812/
Gu Y et al. – Expert review of gastroenterology & hepatology (2023). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/36689199/
Karandish et al. — Sci Rep (2022). [Meta-analysis (10 RCTs)].
Salmani et al. — Clin Nutr ESPEN (2022). [Systematic review & MA].
Ahmad et al. — Sci Rep (2022). [Systematic review & MA (12 RCTs)].
Feduniw S et al. – Nutrients (2022). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/36615817/
Poonyam P et al. – Asian Pacific journal of cancer prevention : APJCP (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/36172650/
Wang J et al. – Oxidative medicine and cellular longevity (2021). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/34616506/
Ashley S et al. – Nutritional neuroscience (2021). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/31661399/
Vadarlis A et al. – Journal of gastroenterology and hepatology (2021). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/32810309/
Lin M et al. – Clinics and research in hepatology and gastroenterology (2021). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/33272889/
Asbaghi et al. — Scientific Reports (Nature) (2020). [Meta-analysis (26 RCTs)]. https://www.nature.com/articles/s41598-020-73741-6
Asbaghi O et al. - Clinical Nutrition ESPEN (2020). [Meta-Analysis]. https://pubmed.ncbi.nlm.nih.gov/32085897/
Ataei-Almanghadim K et al. – Complementary therapies in medicine (2020). [RCT]. https://pubmed.ncbi.nlm.nih.gov/31987231/
Lewis et al. — Cochrane (2019). [Cochrane systematic review]. https://pubmed.ncbi.nlm.nih.gov/31528965/
Jayedi A et al. – Advances in nutrition (Bethesda, Md.) (2018). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/30239557/
Shatzel JJ et al. – Journal of thrombosis and haemostasis : JTH (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/28182323/
Farina N et al. – The Cochrane database of systematic reviews (2017). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/28128435/
Farina N et al. – The Cochrane database of systematic reviews (2017). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/28418065/
Xu W et al. – Journal of neurology, neurosurgery, and psychiatry (2015). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/26294005/
Abner et al. — Cardiovascular Drugs & Therapy (2014). [Meta-analysis (18 RCTs)]. https://link.springer.com/article/10.1007/s10557-014-6560-7
Rizvi et al. — Int J Prev Med (2014). [Review]. https://pubmed.ncbi.nlm.nih.gov/25489440/
Dysken ME et al. - JAMA (TEAM-AD) (2014). [RCT]. https://pubmed.ncbi.nlm.nih.gov/24381967/
Traber MG - Free Radical Biology and Medicine (2014). [Expert Review]. https://pubmed.ncbi.nlm.nih.gov/24746618/
Gutarra-Vilchez RB et al. – The Cochrane database of systematic reviews (2014). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/25310622/
Lopes da Silva S et al. – Alzheimer's & dementia : the journal of the Alzheimer's Association (2014). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/24144963/
Showell MG et al. – The Cochrane database of systematic reviews (2013). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/23913583/
Farina N et al. – The Cochrane database of systematic reviews (2012). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/23152215/
Biglia N et al. – Climacteric : the journal of the International Menopause Society (2009). [RCT]. https://pubmed.ncbi.nlm.nih.gov/19415540/
Isaac MG et al. – The Cochrane database of systematic reviews (2008). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/18646084/
Bordeleau L et al. – Clinical therapeutics (2007). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/17472816/
Ziaei S et al. – Gynecologic and obstetric investigation (2007). [RCT]. https://pubmed.ncbi.nlm.nih.gov/17664882/
Lee et al. — JAMA Cardiol (2005). [Meta-analysis (19 RCTs)]. https://pubmed.ncbi.nlm.nih.gov/15537682/
Miller ER et al. - Annals of Internal Medicine (2005). [Meta-Analysis]. https://pubmed.ncbi.nlm.nih.gov/15668483/
Chertow B – MedGenMed : Medscape general medicine (2004). [Review]. https://pubmed.ncbi.nlm.nih.gov/15647709/
Heck AM et al. – American journal of health-system pharmacy : AJHP : official journal of the American Society of Health-System Pharmacists (2000). [Review]. https://pubmed.ncbi.nlm.nih.gov/10902065/
Tabet N et al. – The Cochrane database of systematic reviews (2000). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/11034775/
The Benefits of Vitamin K2
Bioavailable Form
Vitamin K2 (MK-7) is a fat-soluble vitamin that plays a crucial role in directing calcium to where it is needed (bones and teeth) and away from where it can cause harm (arteries and soft tissues). Often overlooked, K2 works synergistically with vitamin D3 and calcium to support both bone health and cardiovascular wellness.
Key Highlights
- Contributes to the maintenance of normal bones (EFSA approved)
- Contributes to normal blood coagulation (EFSA approved)
- Directs calcium to bones and away from arteries
- Rotterdam Study: 41% lower CHD risk, 57% lower CHD mortality with high K2 intake
- Works synergistically with vitamin D3 and calcium
- MK-7 form has longer half-life for sustained activity
Biochemistry Timeline
Vitamin K2 supplementation can begin to influence osteocalcin carboxylation (a marker of K2 activity) within 2 to 4 weeks. For vascular benefits, the 3-year Knapen study suggests that longer-term supplementation provides the most meaningful cardiovascular improvements.
K2 is fat-soluble and best absorbed when taken with a meal containing some dietary fat. Because it works synergistically with D3, many people find it convenient to take both together. At 180 µg/day of MK-7, significant bone and vascular benefits have been demonstrated in clinical trials.
Women's Cardiovascular Health
The EPIC-NL study (2009), which followed 16,057 women for over 8 years, found that high intake of K2 (specifically the longer-chain menaquinones MK-7, MK-8, MK-9) was associated with reduced coronary heart disease risk in women. Once again, K1 showed no such association.
This is particularly relevant for women, as cardiovascular disease risk increases after menopause due to declining oestrogen levels. K2 supplementation may offer a meaningful layer of cardiovascular support during and after this transition, especially when combined with vitamin D3 and a heart-healthy lifestyle.
Dental Health
Vitamin K2 supports dental health through the same calcium-directing mechanism that benefits bones. By activating osteocalcin, K2 helps ensure that calcium is properly incorporated into teeth, supporting their strength and mineralisation.
EFSA recognises that vitamin K contributes to the maintenance of normal bones, and this extends to the mineralised tissues of teeth. Alongside good oral hygiene and adequate calcium and vitamin D intake, K2 supports the structural foundation of healthy teeth.
Summary
Vitamin K2 (MK-7) is a fat-soluble vitamin that directs calcium to bones and teeth while helping prevent its accumulation in arteries. Large population studies have shown significant cardiovascular benefits unique to K2 (not K1), including reduced heart disease risk and improved arterial flexibility.
K2 works synergistically with vitamin D3 and calcium, making this trio a well-supported combination for bone and cardiovascular health. MK-7 is the most effective form of K2, with a longer half-life and proven benefits at 180 µg/day. It is particularly relevant for postmenopausal women and anyone supplementing with vitamin D3.
FAQs
Why do I need K2 if I already take vitamin D3?
Vitamin D3 increases calcium absorption, but it does not control where that calcium goes. K2 ensures absorbed calcium is directed to bones and teeth rather than depositing in arteries. Think of D3 as the "calcium absorber" and K2 as the "calcium director." They work best together.
Is K2 the same as K1?
No. K1 (phylloquinone) is found in leafy greens and is primarily involved in blood clotting. K2 (menaquinone) has distinct roles in calcium metabolism and cardiovascular health. Population studies consistently show cardiovascular benefits for K2 but not K1.
How much K2 should I take?
Research has shown benefits at 180 µg/day of MK-7. This is the dose used in the Knapen et al. study that demonstrated improved arterial flexibility. Some formulations provide 45-200 µg per day.
Can I take K2 if I am on blood-thinning medication?
If you take warfarin or other vitamin K antagonists, consult your healthcare provider before taking K2 supplements, as vitamin K can interact with these medications. Newer anticoagulants (DOACs) do not interact with vitamin K in the same way, but medical guidance is still recommended.
Is K2 safe during pregnancy?
Vitamin K2 is generally considered safe during pregnancy. It supports maternal bone health and fetal skeletal development. Consult your healthcare provider for personalised dosage guidance.
Research
Ahmed SR et al. – Nutrients (2026). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/41599883/
Frontiers Endocrinol SR — Front Endocrinol (2025). [Systematic review & MA]. https://www.frontiersin.org/journals/endocrinology/articles/10.3389/fendo.2025.1703116/full
Hashim MH et al. – Medicina (Kaunas, Lithuania) (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/40428819/
Nikpayam O et al. – Prostaglandins & other lipid mediators (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/40054729/
Zhang Z et al. – Frontiers in endocrinology (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/41268154/
Wen Z et al. – Frontiers in nutrition (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/41393956/
Zhang YS et al. – Frontiers in medicine (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/40678144/
Talasaz AH et al. – Seminars in thrombosis and hemostasis (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/39288907/
Bone Joint Res 2024 - VK bone MA (2024). [SR + MA (RCTs)]. https://pmc.ncbi.nlm.nih.gov/articles/PMC11631259/
Mantle et al. — Foods (2024). [Clinical review]. https://www.mdpi.com/2304-8158/13/11/1646
Bone & Joint Research - BMD Meta-Analysis (2024). [Meta-Analysis]. https://boneandjoint.org.uk/Article/10.1302/2046-3758.1312.BJR-2024-0053.R1
Zhao QY et al. – Journal of nutritional science (2024). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/38282652/
Xie C et al. – Bone & joint research (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/39657786/
Mittal P et al. – Hematology. American Society of Hematology. Education Program (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/39644000/
Olie RH et al. – Annual review of pharmacology and toxicology (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/37758192/
Li et al. — Front Nutr (2023). [Systematic review & MA (14 RCTs)]. https://doi.org/10.3389/fnut.2023.1115069
Levy-Schousboe K et al. – Nephrology, dialysis, transplantation : official publication of the European Dialysis and Transplant Association - European Renal Association (2023). [RCT]. https://pubmed.ncbi.nlm.nih.gov/36460034/
Ma ML et al. – Frontiers in public health (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/36033779/
Abrignani MG et al. – European journal of internal medicine (2021). [Review]. https://pubmed.ncbi.nlm.nih.gov/33279389/
Zhang Y et al. – Calcified tissue international (2020). [RCT]. https://pubmed.ncbi.nlm.nih.gov/32060566/
Sato T et al. — Nutrients (2020). [Review]. https://pubmed.ncbi.nlm.nih.gov/32429440/
Halder et al. — Br J Nutr (2019). [Review]. General
Zwakenberg et al. — Atherosclerosis (2019). [Meta-analysis (8 RCTs)]. https://pubmed.ncbi.nlm.nih.gov/31395386/
Drugs for atrial fibrillation. (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/31599871/
Halder M et al. — Int J Mol Sci (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/31443207/
Akbari S & Rasouli-Ghahroudi AA — J Clin Diagn Res (2018). [Review]. https://pubmed.ncbi.nlm.nih.gov/30584505/
Schwalfenberg — Clin Nutr (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/28040563/
Palermo A et al. – Metabolism: clinical and experimental (2017). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/28403946/
Di Minno A et al. – Blood reviews (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/28196633/
Dahlberg S et al. – Scandinavian journal of clinical and laboratory investigation (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/28933567/
Schwalfenberg GK — Nutrients (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/28621712/
Violi F et al. – Medicine (2016). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/26962786/
Knapen - 3yr postmenopausal RCT (2015). [RCT (3yr, n=244)]. https://pmc.ncbi.nlm.nih.gov/articles/PMC8483258/
Maresz — Integr Med (2015). [Review]. https://pubmed.ncbi.nlm.nih.gov/26770156/
Knapen MHJ et al. - Thrombosis and Haemostasis (2015). [RCT]. https://pubmed.ncbi.nlm.nih.gov/25694037/
Knapen MH et al. — Thromb Haemost (2015). [RCT]. https://pubmed.ncbi.nlm.nih.gov/25694037/
Maresz K — Integr Med (Encinitas) (2015). [Review]. https://pubmed.ncbi.nlm.nih.gov/26770129/
Ghanny S et al. – Current drug discovery technologies (2012). [Review]. https://pubmed.ncbi.nlm.nih.gov/22023256/
Sato Y et al. – The Kurume medical journal (2011). [RCT]. https://pubmed.ncbi.nlm.nih.gov/21778673/
EPIC-NL - K2 CHD women (n=16,057) (2009). [Prospective cohort (8.1yr)]. https://www.mdpi.com/2304-8158/13/11/1646
Beulens et al. — Nutr Metab Cardiovasc Dis (2009). [Prospective cohort]. https://pubmed.ncbi.nlm.nih.gov/18722618/
Beulens JWJ et al. - Atherosclerosis (2009). [Prospective Cohort]. https://pubmed.ncbi.nlm.nih.gov/19179985/
Stevenson M et al. – Health technology assessment (Winchester, England) (2009). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/19818211/
Beulens JW et al. — Atherosclerosis (2009). [Prospective cohort]. https://pubmed.ncbi.nlm.nih.gov/19179058/
Ishida Y – Clinical calcium (2008). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/18830045/
Sinxadi P et al. – Cardiovascular journal of Africa (2008). [Review]. https://pubmed.ncbi.nlm.nih.gov/18776969/
Whelan AM et al. – The Annals of pharmacotherapy (2006). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/16670364/
Rotterdam Study - K2 cardiovascular (2004). [Prospective cohort (n=4,807)]. https://pubmed.ncbi.nlm.nih.gov/15514282/
Geleijnse et al. — J Nutr (2004). [Prospective cohort (Rotterdam Study)]. https://pubmed.ncbi.nlm.nih.gov/15514282/
Geleijnse JM et al. - Journal of Nutrition (Rotterdam Study) (2004). [Prospective Cohort]. https://pubmed.ncbi.nlm.nih.gov/15514282/
Geleijnse JM et al. — J Nutr (2004). [Prospective cohort]. https://pubmed.ncbi.nlm.nih.gov/15514282/
51 studies — Vitamin K2
Ahmed SR et al. – Nutrients (2026). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/41599883/
Frontiers Endocrinol SR — Front Endocrinol (2025). [Systematic review & MA]. https://www.frontiersin.org/journals/endocrinology/articles/10.3389/fendo.2025.1703116/full
Hashim MH et al. – Medicina (Kaunas, Lithuania) (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/40428819/
Nikpayam O et al. – Prostaglandins & other lipid mediators (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/40054729/
Zhang Z et al. – Frontiers in endocrinology (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/41268154/
Wen Z et al. – Frontiers in nutrition (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/41393956/
Zhang YS et al. – Frontiers in medicine (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/40678144/
Talasaz AH et al. – Seminars in thrombosis and hemostasis (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/39288907/
Bone Joint Res 2024 - VK bone MA (2024). [SR + MA (RCTs)]. https://pmc.ncbi.nlm.nih.gov/articles/PMC11631259/
Mantle et al. — Foods (2024). [Clinical review]. https://www.mdpi.com/2304-8158/13/11/1646
Bone & Joint Research - BMD Meta-Analysis (2024). [Meta-Analysis]. https://boneandjoint.org.uk/Article/10.1302/2046-3758.1312.BJR-2024-0053.R1
Zhao QY et al. – Journal of nutritional science (2024). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/38282652/
Xie C et al. – Bone & joint research (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/39657786/
Mittal P et al. – Hematology. American Society of Hematology. Education Program (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/39644000/
Olie RH et al. – Annual review of pharmacology and toxicology (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/37758192/
Li et al. — Front Nutr (2023). [Systematic review & MA (14 RCTs)]. https://doi.org/10.3389/fnut.2023.1115069
Levy-Schousboe K et al. – Nephrology, dialysis, transplantation : official publication of the European Dialysis and Transplant Association - European Renal Association (2023). [RCT]. https://pubmed.ncbi.nlm.nih.gov/36460034/
Ma ML et al. – Frontiers in public health (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/36033779/
Abrignani MG et al. – European journal of internal medicine (2021). [Review]. https://pubmed.ncbi.nlm.nih.gov/33279389/
Zhang Y et al. – Calcified tissue international (2020). [RCT]. https://pubmed.ncbi.nlm.nih.gov/32060566/
Sato T et al. — Nutrients (2020). [Review]. https://pubmed.ncbi.nlm.nih.gov/32429440/
Halder et al. — Br J Nutr (2019). [Review]. General
Zwakenberg et al. — Atherosclerosis (2019). [Meta-analysis (8 RCTs)]. https://pubmed.ncbi.nlm.nih.gov/31395386/
Drugs for atrial fibrillation. (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/31599871/
Halder M et al. — Int J Mol Sci (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/31443207/
Akbari S & Rasouli-Ghahroudi AA — J Clin Diagn Res (2018). [Review]. https://pubmed.ncbi.nlm.nih.gov/30584505/
Schwalfenberg — Clin Nutr (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/28040563/
Palermo A et al. – Metabolism: clinical and experimental (2017). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/28403946/
Di Minno A et al. – Blood reviews (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/28196633/
Dahlberg S et al. – Scandinavian journal of clinical and laboratory investigation (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/28933567/
Schwalfenberg GK — Nutrients (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/28621712/
Violi F et al. – Medicine (2016). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/26962786/
Knapen - 3yr postmenopausal RCT (2015). [RCT (3yr, n=244)]. https://pmc.ncbi.nlm.nih.gov/articles/PMC8483258/
Maresz — Integr Med (2015). [Review]. https://pubmed.ncbi.nlm.nih.gov/26770156/
Knapen MHJ et al. - Thrombosis and Haemostasis (2015). [RCT]. https://pubmed.ncbi.nlm.nih.gov/25694037/
Knapen MH et al. — Thromb Haemost (2015). [RCT]. https://pubmed.ncbi.nlm.nih.gov/25694037/
Maresz K — Integr Med (Encinitas) (2015). [Review]. https://pubmed.ncbi.nlm.nih.gov/26770129/
Ghanny S et al. – Current drug discovery technologies (2012). [Review]. https://pubmed.ncbi.nlm.nih.gov/22023256/
Sato Y et al. – The Kurume medical journal (2011). [RCT]. https://pubmed.ncbi.nlm.nih.gov/21778673/
EPIC-NL - K2 CHD women (n=16,057) (2009). [Prospective cohort (8.1yr)]. https://www.mdpi.com/2304-8158/13/11/1646
Beulens et al. — Nutr Metab Cardiovasc Dis (2009). [Prospective cohort]. https://pubmed.ncbi.nlm.nih.gov/18722618/
Beulens JWJ et al. - Atherosclerosis (2009). [Prospective Cohort]. https://pubmed.ncbi.nlm.nih.gov/19179985/
Stevenson M et al. – Health technology assessment (Winchester, England) (2009). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/19818211/
Beulens JW et al. — Atherosclerosis (2009). [Prospective cohort]. https://pubmed.ncbi.nlm.nih.gov/19179058/
Ishida Y – Clinical calcium (2008). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/18830045/
Sinxadi P et al. – Cardiovascular journal of Africa (2008). [Review]. https://pubmed.ncbi.nlm.nih.gov/18776969/
Whelan AM et al. – The Annals of pharmacotherapy (2006). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/16670364/
Rotterdam Study - K2 cardiovascular (2004). [Prospective cohort (n=4,807)]. https://pubmed.ncbi.nlm.nih.gov/15514282/
Geleijnse et al. — J Nutr (2004). [Prospective cohort (Rotterdam Study)]. https://pubmed.ncbi.nlm.nih.gov/15514282/
Geleijnse JM et al. - Journal of Nutrition (Rotterdam Study) (2004). [Prospective Cohort]. https://pubmed.ncbi.nlm.nih.gov/15514282/
Geleijnse JM et al. — J Nutr (2004). [Prospective cohort]. https://pubmed.ncbi.nlm.nih.gov/15514282/
The Benefits of Vitamin C
Antioxidant
Vitamin C is a powerful antioxidant essential for immune function, collagen formation, and the protection of cells from oxidative stress. We use vitamin C derived from acerola cherry, a whole-food source that provides naturally occurring bioflavonoids alongside the vitamin C, which may support better absorption compared to synthetic ascorbic acid.
Key Highlights
- Contributes to the normal function of the immune system (EFSA approved)
- Supports normal collagen formation for skin, blood vessels, bones, cartilage, gums, and teeth (EFSA approved)
- Contributes to the protection of cells from oxidative stress (EFSA approved)
- Increases iron absorption (EFSA approved)
- Contributes to the reduction of tiredness and fatigue (EFSA approved)
- Supports normal energy-yielding metabolism (EFSA approved)
- Derived from acerola cherry for enhanced bioavailability
Biochemistry Timeline
Vitamin C is water-soluble, meaning the body does not store it and relies on regular daily intake. Blood levels can improve within days of starting supplementation, and immune function benefits are generally seen with consistent daily intake of 200 mg or more.
For collagen-related benefits (skin firmness, wound healing), consistent supplementation over 8 to 12 weeks is typically needed to see visible improvements, as collagen turnover in the skin is a gradual process.
Energy and Fatigue
Vitamin C contributes to normal energy-yielding metabolism and to the reduction of tiredness and fatigue, both EFSA-approved health claims. It plays a role in the metabolism of fats and the production of carnitine, a molecule that helps transport fatty acids into mitochondria for energy production.
For those experiencing persistent fatigue, ensuring adequate vitamin C intake supports the body's ability to produce energy efficiently. This is particularly relevant for smokers, who have 25% lower plasma vitamin C levels and are recommended to consume an additional 35 mg/day (IOM recommendation).
Antioxidant Protection
Vitamin C is one of the body's primary water-soluble antioxidants. It neutralises free radicals, protects cellular components from oxidative damage, and helps regenerate other antioxidants, including vitamin E.
This antioxidant function is important for overall health, as oxidative stress is implicated in ageing, cardiovascular disease, and various chronic conditions. By choosing acerola cherry as our source, the naturally occurring bioflavonoids and plant compounds provide additional antioxidant support beyond vitamin C alone. EFSA recognises that vitamin C contributes to the protection of cells from oxidative stress.
Summary
Vitamin C is an essential antioxidant that supports immune function, collagen formation, iron absorption, and energy production. We use acerola cherry as a whole-food source, providing naturally occurring bioflavonoids for potentially enhanced absorption. Regular supplementation reduces cold duration and supports the body's daily needs.
As a water-soluble vitamin, consistent daily intake is important since the body does not store vitamin C. It is particularly relevant for those with higher needs, including smokers, women with iron absorption concerns, and anyone seeking to support skin health and immune resilience.
FAQs
Why acerola cherry instead of synthetic vitamin C?
Acerola cherry is one of nature's richest sources of vitamin C and provides it alongside bioflavonoids and other plant compounds that may enhance absorption and provide additional antioxidant benefits. It represents a whole-food approach to vitamin C supplementation.
How much vitamin C do I need daily?
The recommended daily intake for adults in the EU is 80 mg. For immune support during and after exercise, EFSA recognises benefits at 200 mg/day. The European upper limit is 1,000 mg/day from supplements. Most people benefit from 200-500 mg/day.
Can I take too much vitamin C?
Because vitamin C is water-soluble, excess amounts are excreted in urine. However, very high doses (above 1,000 mg/day) can cause digestive discomfort in some people and may increase the risk of kidney stones in susceptible individuals.
Does vitamin C really prevent colds?
Research shows that regular vitamin C supplementation does not prevent colds in the general population but does reduce their duration (by about 8% in adults) and severity. The benefit is more pronounced in those under physical stress.
Is vitamin C safe during pregnancy?
Yes, vitamin C is important during pregnancy for both mother and baby. It supports iron absorption, immune function, and collagen formation. Follow your healthcare provider's guidance on dosage.
Research
Hořavová H et al. – Ceska a Slovenska farmacie : casopis Ceske farmaceuticke spolecnosti a Slovenske farmaceuticke spolecnosti (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/41412811/
Ivaskiene T et al. – Frontiers in nutrition (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/41459089/
Kumar V et al. – Recent advances in food, nutrition & agriculture (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/39108105/
Rawat et al. — J Med Life (2024). [Systematic review & MA]. General
Bayu P et al. – PloS one (2024). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/38820340/
Oargă Porumb DP et al. – Frontiers in pharmacology (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/38666029/
Hamie H et al. – International journal of women's dermatology (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/38873621/
Wylenzek F et al. – Archives of gynecology and obstetrics (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/38935105/
Xu C et al. – Nutrients (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/37111066/
Zheng SH et al. – Reproductive biology and endocrinology : RB&E (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/37644533/
Berry K et al. – Clinics in plastic surgery (2023). [Review]. https://pubmed.ncbi.nlm.nih.gov/37169404/
Dumoulin M et al. - Journal of Cosmetic Dermatology (2023). [RCT]. Skin Health
Lee et al. — RCT (2023). [RCT]. https://pubmed.ncbi.nlm.nih.gov/37786445/
Ordaz G et al. – Actas urologicas espanolas (2023). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/36754205/
Skolmowska D et al. – Nutrients (2022). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/35807904/
Berry K et al. – Facial plastic surgery clinics of North America (2022). [Review]. https://pubmed.ncbi.nlm.nih.gov/35934431/
Wiesner A et al. – Pharmaceuticals (Basel, Switzerland) (2021). [Review]. https://pubmed.ncbi.nlm.nih.gov/33801406/
Lykkesfeldt & Tveden-Nyborg — Nutrients (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/31405241/
Mousavi S et al. - European Journal of Clinical Nutrition (2019). [Meta-Analysis]. https://pubmed.ncbi.nlm.nih.gov/30738092/
DiBaise M et al. – Nutrition in clinical practice : official publication of the American Society for Parenteral and Enteral Nutrition (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/31144371/
Liugan M et al. – Nutrients (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/31487891/
Carr AC & Cook J — Front Physiol (2018). [Review]. https://pubmed.ncbi.nlm.nih.gov/29740326/
Carr & Maggini — Nutrients (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/29099763/
Pullar et al. — Nutrients (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/28805671/
Carr AC & Maggini S - Nutrients (2017). [Comprehensive Review]. https://pubmed.ncbi.nlm.nih.gov/29099763/
Skelin M et al. – Clinical therapeutics (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/28153426/
Carr AC & Maggini S — Nutrients (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/29099763/
Pullar JM et al. — Nutrients (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/28805671/
Moser & Chun — Adv Nutr (2016). [Review]. General
Moser MA & Chun OK - Nutrients (2016). [Systematic Review]. https://pubmed.ncbi.nlm.nih.gov/27725322/
Smith et al. — Nutrients (2016). [Review]. General
White DJ et al. - Nutrients (2016). [Meta-Analysis]. https://pubmed.ncbi.nlm.nih.gov/28045446/
Kennedy DO - Nutrients (2016). [Comprehensive Review]. https://pubmed.ncbi.nlm.nih.gov/26828517/
Padayatty SJ & Levine M — Oral Dis (2016). [Review]. https://pubmed.ncbi.nlm.nih.gov/26808119/
Moser MA & Chun OK — Int J Mol Sci (2016). [Review]. https://pubmed.ncbi.nlm.nih.gov/27649222/
Bucher A & White N — Front Immunol (2016). [Review]. https://pubmed.ncbi.nlm.nih.gov/27994589/
Lykkesfeldt J et al. - British Journal of Nutrition (2014). [Review]. https://pubmed.ncbi.nlm.nih.gov/24709223/
Lykkesfeldt J et al. — Adv Nutr (2014). [Review]. https://pubmed.ncbi.nlm.nih.gov/24458010/
Hemilä — Cochrane Review (2013 (updated)). [Meta-analysis (29 RCTs)]. https://www.cochranelibrary.com/cdsr/doi/10.1002/14651858.CD000980.pub4
Hemilä & Chalker — Cochrane (2013). [Cochrane MA (29 RCTs)].
Hemilä & Chalker — Cochrane (2013). [Cochrane systematic review (29 RCTs)]. https://pubmed.ncbi.nlm.nih.gov/23440782/
Hemilä H & Chalker E - Cochrane Database of Systematic Reviews (2013). [Cochrane Review]. https://pubmed.ncbi.nlm.nih.gov/23440782/
Hemila H & Chalker E — Cochrane Database Syst Rev (2013). [Cochrane review]. https://pubmed.ncbi.nlm.nih.gov/23440782/
Michaels JA et al. - Advances in Skin & Wound Care (2012). [Systematic Review]. https://pubmed.ncbi.nlm.nih.gov/22441049/
Stough C et al. - Human Psychopharmacology (2011). [RCT]. https://pubmed.ncbi.nlm.nih.gov/21905094/
Cosgrove MC et al. - American Journal of Clinical Nutrition (2007). [Cohort Study]. https://pubmed.ncbi.nlm.nih.gov/17921406/
Fishman SM et al. – Public health nutrition (2000). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/10948381/
IOM — Smoker recommendation (Established). [Expert guideline]. General
Antioxidant skin protection (Established). [Mechanistic]. General
Vitamin C absorption — whole food vs synthetic (Established). [Comparative]. General
Natural vs synthetic C — established (Established). [Comparative analysis].
51 studies — Vitamin C
Hořavová H et al. – Ceska a Slovenska farmacie : casopis Ceske farmaceuticke spolecnosti a Slovenske farmaceuticke spolecnosti (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/41412811/
Ivaskiene T et al. – Frontiers in nutrition (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/41459089/
Kumar V et al. – Recent advances in food, nutrition & agriculture (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/39108105/
Rawat et al. — J Med Life (2024). [Systematic review & MA]. General
Bayu P et al. – PloS one (2024). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/38820340/
Oargă Porumb DP et al. – Frontiers in pharmacology (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/38666029/
Hamie H et al. – International journal of women's dermatology (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/38873621/
Wylenzek F et al. – Archives of gynecology and obstetrics (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/38935105/
Xu C et al. – Nutrients (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/37111066/
Zheng SH et al. – Reproductive biology and endocrinology : RB&E (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/37644533/
Berry K et al. – Clinics in plastic surgery (2023). [Review]. https://pubmed.ncbi.nlm.nih.gov/37169404/
Dumoulin M et al. - Journal of Cosmetic Dermatology (2023). [RCT]. Skin Health
Lee et al. — RCT (2023). [RCT]. https://pubmed.ncbi.nlm.nih.gov/37786445/
Ordaz G et al. – Actas urologicas espanolas (2023). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/36754205/
Skolmowska D et al. – Nutrients (2022). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/35807904/
Berry K et al. – Facial plastic surgery clinics of North America (2022). [Review]. https://pubmed.ncbi.nlm.nih.gov/35934431/
Wiesner A et al. – Pharmaceuticals (Basel, Switzerland) (2021). [Review]. https://pubmed.ncbi.nlm.nih.gov/33801406/
Lykkesfeldt & Tveden-Nyborg — Nutrients (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/31405241/
Mousavi S et al. - European Journal of Clinical Nutrition (2019). [Meta-Analysis]. https://pubmed.ncbi.nlm.nih.gov/30738092/
DiBaise M et al. – Nutrition in clinical practice : official publication of the American Society for Parenteral and Enteral Nutrition (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/31144371/
Liugan M et al. – Nutrients (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/31487891/
Carr AC & Cook J — Front Physiol (2018). [Review]. https://pubmed.ncbi.nlm.nih.gov/29740326/
Carr & Maggini — Nutrients (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/29099763/
Pullar et al. — Nutrients (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/28805671/
Carr AC & Maggini S - Nutrients (2017). [Comprehensive Review]. https://pubmed.ncbi.nlm.nih.gov/29099763/
Skelin M et al. – Clinical therapeutics (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/28153426/
Carr AC & Maggini S — Nutrients (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/29099763/
Pullar JM et al. — Nutrients (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/28805671/
Moser & Chun — Adv Nutr (2016). [Review]. General
Moser MA & Chun OK - Nutrients (2016). [Systematic Review]. https://pubmed.ncbi.nlm.nih.gov/27725322/
Smith et al. — Nutrients (2016). [Review]. General
White DJ et al. - Nutrients (2016). [Meta-Analysis]. https://pubmed.ncbi.nlm.nih.gov/28045446/
Kennedy DO - Nutrients (2016). [Comprehensive Review]. https://pubmed.ncbi.nlm.nih.gov/26828517/
Padayatty SJ & Levine M — Oral Dis (2016). [Review]. https://pubmed.ncbi.nlm.nih.gov/26808119/
Moser MA & Chun OK — Int J Mol Sci (2016). [Review]. https://pubmed.ncbi.nlm.nih.gov/27649222/
Bucher A & White N — Front Immunol (2016). [Review]. https://pubmed.ncbi.nlm.nih.gov/27994589/
Lykkesfeldt J et al. - British Journal of Nutrition (2014). [Review]. https://pubmed.ncbi.nlm.nih.gov/24709223/
Lykkesfeldt J et al. — Adv Nutr (2014). [Review]. https://pubmed.ncbi.nlm.nih.gov/24458010/
Hemilä — Cochrane Review (2013 (updated)). [Meta-analysis (29 RCTs)]. https://www.cochranelibrary.com/cdsr/doi/10.1002/14651858.CD000980.pub4
Hemilä & Chalker — Cochrane (2013). [Cochrane MA (29 RCTs)].
Hemilä & Chalker — Cochrane (2013). [Cochrane systematic review (29 RCTs)]. https://pubmed.ncbi.nlm.nih.gov/23440782/
Hemilä H & Chalker E - Cochrane Database of Systematic Reviews (2013). [Cochrane Review]. https://pubmed.ncbi.nlm.nih.gov/23440782/
Hemila H & Chalker E — Cochrane Database Syst Rev (2013). [Cochrane review]. https://pubmed.ncbi.nlm.nih.gov/23440782/
Michaels JA et al. - Advances in Skin & Wound Care (2012). [Systematic Review]. https://pubmed.ncbi.nlm.nih.gov/22441049/
Stough C et al. - Human Psychopharmacology (2011). [RCT]. https://pubmed.ncbi.nlm.nih.gov/21905094/
Cosgrove MC et al. - American Journal of Clinical Nutrition (2007). [Cohort Study]. https://pubmed.ncbi.nlm.nih.gov/17921406/
Fishman SM et al. – Public health nutrition (2000). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/10948381/
IOM — Smoker recommendation (Established). [Expert guideline]. General
Antioxidant skin protection (Established). [Mechanistic]. General
Vitamin C absorption — whole food vs synthetic (Established). [Comparative]. General
Natural vs synthetic C — established (Established). [Comparative analysis].
The Benefits of Thiamine
Bioavailable Form
Thiamine (Vitamin B1) is an essential water-soluble vitamin that plays a fundamental role in energy metabolism and nervous system function. It is the first B vitamin that was discovered, and it helps convert carbohydrates into energy, making it essential for every cell in the body, particularly the brain and heart.
Key Highlights
- Contributes to normal energy-yielding metabolism (EFSA approved)
- Supports normal heart function (EFSA approved)
- Contributes to normal functioning of the nervous system (EFSA approved)
- Supports normal psychological function (EFSA approved)
- First B vitamin discovered; essential for carbohydrate metabolism
- Brain and heart are particularly dependent on thiamine
Biochemistry Timeline
Thiamine is water-soluble with limited body storage. Blood levels respond to supplementation within 1 to 2 weeks. Because it is not stored efficiently, consistent daily intake is important. Thiamine is well-tolerated with no established upper limit, as excess is readily excreted.
Cognitive Function
Thiamine supports cognitive function through its essential role in brain energy metabolism. The brain's heavy reliance on glucose means that even mild thiamine insufficiency can affect mental clarity, concentration, and memory. Ensuring adequate thiamine supports sharp, clear thinking.
Digestive Health
Thiamine supports the production of hydrochloric acid in the stomach, which is necessary for proper digestion and nutrient absorption. It also supports the muscle tone of the digestive tract, helping maintain healthy bowel function.
Summary
Thiamine (Vitamin B1) is essential for energy metabolism, heart function, and nervous system health. As the body cannot store thiamine efficiently, regular daily intake supports consistent energy production and cognitive function. EFSA recognises its contributions to energy metabolism, heart function, nervous system function, and psychological function.
FAQs
How much thiamine do I need?
The recommended daily intake for adults is 1.1 mg. There is no established upper limit as excess thiamine is excreted in urine. Supplemental doses of 1-100 mg are commonly used.
Are there any side effects?
Thiamine is considered very safe. Excess is efficiently excreted in urine. Side effects are extremely rare even at high doses.
Is thiamine safe during pregnancy?
Yes, thiamine is essential during pregnancy for maternal and fetal energy metabolism. Recommended intake is slightly higher during pregnancy.
Research
Wang H, Wang Y, Li C et al. (2026). Association of thiamine supplementation with 30-day mortality among ICU patients with sepsis-associated delirium. Sci Rep. https://pubmed.ncbi.nlm.nih.gov/41872438/
Sumboonnanonda R, Vijarnsorn C, Saengpanit P et al. (2026). Impact of thiamin supplementation on thiamin pyrophosphate effect and cardiac function in pediatric heart disease patients on diuretics: a randomized controlled trial. Sci Rep. https://pubmed.ncbi.nlm.nih.gov/41872295/
Yin M, Jing X, He Q et al. (2026). Thiamine supplementation is associated with lower in-hospital and ICU mortality in patients with acute respiratory failure: a retrospective cohort study based on the MIMIC-IV database. BMC Pulm Med. https://pubmed.ncbi.nlm.nih.gov/41862834/
Liang W, Chen Y, Zeng Y et al. (2026). A hemodialysis patient with recurrent Wernicke encephalopathy showed reversible lentiform fork sign: A case report. Medicine (Baltimore). https://pubmed.ncbi.nlm.nih.gov/41861210/
Rahaman A, Blanckart L, Hanelt D et al. (2026). Unraveling filamentous algae as a renewable bioresource for advanced moisture-absorbent innovative aquatic fibers. Bioresour Bioprocess. https://pubmed.ncbi.nlm.nih.gov/41843345/
Hrouch W, Naji Y, Hamza L et al. (2026). Duodenal Lymphocytosis and B1 Deficiency: Unveiling the Overlap Between Gut and Brain. Cureus. https://pubmed.ncbi.nlm.nih.gov/41798567/
Fu AS, Osman F, Cameron-Smith D et al. (2026). Micronutrient intake and status of adults consuming plant-based meat analogues or animal-based meats as primary protein source: An 8-week randomized controlled trial. Clin Nutr. https://pubmed.ncbi.nlm.nih.gov/41785660/
Michiwaki Y, Nishimiya J, Kumagawa T et al. (2026). Marchiafava-Bignami disease mimicking acute corpus callosum infarction associated with chronic shochu consumption. Surg Neurol Int. https://pubmed.ncbi.nlm.nih.gov/41783222/
Ma Y, Zhang J, Chen C et al. (2026). Thiamine ameliorates subacute ruminal acidosis-induced mastitis in goats and is associated with modulation of the NF-κB/NLRP3/CLOCK axis and rumen microbial homeostasis. J Dairy Sci. https://pubmed.ncbi.nlm.nih.gov/41780867/
Miteva MT, Laurenti D, Mattioli R et al. (2026). Vitamin deficiencies and Alzheimer's disease: evidence and implications for supplementation. Front Nutr [Review]. https://pubmed.ncbi.nlm.nih.gov/41769656/
Vine J, Lee JH, Simpson MD et al. (2026). Baseline measurements of cellular respiration affect the response to thiamine treatment in post-arrest patients. Resuscitation. https://pubmed.ncbi.nlm.nih.gov/41759812/
Xue F, Zhang F, Zhuang Q et al. (2026). Metagenomic Insights into the Modulatory Effects of Thiamine Supplementation for Treating Subclinical Ketosis Dairy Cows. Animals (Basel). https://pubmed.ncbi.nlm.nih.gov/41751141/
Neupane A, Shahi A, Adhikari B (2026). Wernicke-Korsakoff Syndrome a Rare Complication of Hyperemesis Gravidarum: Case Report. Clin Case Rep. https://pubmed.ncbi.nlm.nih.gov/41727741/
Ilyasova A, Eusebio R, Raff L et al. (2026). Wernicke Encephalopathy Associated with Malabsorption in Degos Disease. J Investig Med High Impact Case Rep. https://pubmed.ncbi.nlm.nih.gov/41717716/
Anderson YT, Priest K, Zastre J (2026). Vitamin B1 protects against Aβ(1-42)-induced HIF-1α activation and neurotoxicity. Neurochem Int. https://pubmed.ncbi.nlm.nih.gov/41707701/
Rosewarne RE, Farina N (2026). Thiamine Use in Hospitalized Patients: A Clinical Review. J Nutr Metab [Review]. https://pubmed.ncbi.nlm.nih.gov/41684754/
Işık T, Garipağaoğlu M (2026). Assessment of the nutritional status of Syrian refugee women in the lactation period. Nutr Health. https://pubmed.ncbi.nlm.nih.gov/41662259/
Freddy M, Larsen TB, Patel S (2026). See One, B1, Treat One: Identifying and Managing Thiamine Deficiency in a Patient With Altered Mental Status. Cureus. https://pubmed.ncbi.nlm.nih.gov/41640937/
Alanazi MA (2026). Intravenous Thiamine-Induced Thrombocytopenia in a Patient With Chronic Adrenal Insufficiency. J Med Cases. https://pubmed.ncbi.nlm.nih.gov/41631281/
Goyer A, Phillips R, Seidel A et al. (2026). Thiamin addition to soil increases potato tuber thiamin content under greenhouse conditions. PeerJ. https://pubmed.ncbi.nlm.nih.gov/41630844/
20 studies — Thiamine
Wang H, Wang Y, Li C et al. (2026). Association of thiamine supplementation with 30-day mortality among ICU patients with sepsis-associated delirium. Sci Rep. https://pubmed.ncbi.nlm.nih.gov/41872438/
Sumboonnanonda R, Vijarnsorn C, Saengpanit P et al. (2026). Impact of thiamin supplementation on thiamin pyrophosphate effect and cardiac function in pediatric heart disease patients on diuretics: a randomized controlled trial. Sci Rep. https://pubmed.ncbi.nlm.nih.gov/41872295/
Yin M, Jing X, He Q et al. (2026). Thiamine supplementation is associated with lower in-hospital and ICU mortality in patients with acute respiratory failure: a retrospective cohort study based on the MIMIC-IV database. BMC Pulm Med. https://pubmed.ncbi.nlm.nih.gov/41862834/
Liang W, Chen Y, Zeng Y et al. (2026). A hemodialysis patient with recurrent Wernicke encephalopathy showed reversible lentiform fork sign: A case report. Medicine (Baltimore). https://pubmed.ncbi.nlm.nih.gov/41861210/
Rahaman A, Blanckart L, Hanelt D et al. (2026). Unraveling filamentous algae as a renewable bioresource for advanced moisture-absorbent innovative aquatic fibers. Bioresour Bioprocess. https://pubmed.ncbi.nlm.nih.gov/41843345/
Hrouch W, Naji Y, Hamza L et al. (2026). Duodenal Lymphocytosis and B1 Deficiency: Unveiling the Overlap Between Gut and Brain. Cureus. https://pubmed.ncbi.nlm.nih.gov/41798567/
Fu AS, Osman F, Cameron-Smith D et al. (2026). Micronutrient intake and status of adults consuming plant-based meat analogues or animal-based meats as primary protein source: An 8-week randomized controlled trial. Clin Nutr. https://pubmed.ncbi.nlm.nih.gov/41785660/
Michiwaki Y, Nishimiya J, Kumagawa T et al. (2026). Marchiafava-Bignami disease mimicking acute corpus callosum infarction associated with chronic shochu consumption. Surg Neurol Int. https://pubmed.ncbi.nlm.nih.gov/41783222/
Ma Y, Zhang J, Chen C et al. (2026). Thiamine ameliorates subacute ruminal acidosis-induced mastitis in goats and is associated with modulation of the NF-κB/NLRP3/CLOCK axis and rumen microbial homeostasis. J Dairy Sci. https://pubmed.ncbi.nlm.nih.gov/41780867/
Miteva MT, Laurenti D, Mattioli R et al. (2026). Vitamin deficiencies and Alzheimer's disease: evidence and implications for supplementation. Front Nutr [Review]. https://pubmed.ncbi.nlm.nih.gov/41769656/
Vine J, Lee JH, Simpson MD et al. (2026). Baseline measurements of cellular respiration affect the response to thiamine treatment in post-arrest patients. Resuscitation. https://pubmed.ncbi.nlm.nih.gov/41759812/
Xue F, Zhang F, Zhuang Q et al. (2026). Metagenomic Insights into the Modulatory Effects of Thiamine Supplementation for Treating Subclinical Ketosis Dairy Cows. Animals (Basel). https://pubmed.ncbi.nlm.nih.gov/41751141/
Neupane A, Shahi A, Adhikari B (2026). Wernicke-Korsakoff Syndrome a Rare Complication of Hyperemesis Gravidarum: Case Report. Clin Case Rep. https://pubmed.ncbi.nlm.nih.gov/41727741/
Ilyasova A, Eusebio R, Raff L et al. (2026). Wernicke Encephalopathy Associated with Malabsorption in Degos Disease. J Investig Med High Impact Case Rep. https://pubmed.ncbi.nlm.nih.gov/41717716/
Anderson YT, Priest K, Zastre J (2026). Vitamin B1 protects against Aβ(1-42)-induced HIF-1α activation and neurotoxicity. Neurochem Int. https://pubmed.ncbi.nlm.nih.gov/41707701/
Rosewarne RE, Farina N (2026). Thiamine Use in Hospitalized Patients: A Clinical Review. J Nutr Metab [Review]. https://pubmed.ncbi.nlm.nih.gov/41684754/
Işık T, Garipağaoğlu M (2026). Assessment of the nutritional status of Syrian refugee women in the lactation period. Nutr Health. https://pubmed.ncbi.nlm.nih.gov/41662259/
Freddy M, Larsen TB, Patel S (2026). See One, B1, Treat One: Identifying and Managing Thiamine Deficiency in a Patient With Altered Mental Status. Cureus. https://pubmed.ncbi.nlm.nih.gov/41640937/
Alanazi MA (2026). Intravenous Thiamine-Induced Thrombocytopenia in a Patient With Chronic Adrenal Insufficiency. J Med Cases. https://pubmed.ncbi.nlm.nih.gov/41631281/
Goyer A, Phillips R, Seidel A et al. (2026). Thiamin addition to soil increases potato tuber thiamin content under greenhouse conditions. PeerJ. https://pubmed.ncbi.nlm.nih.gov/41630844/
The Benefits of Vitamin B2
Bioavailable Form
Riboflavin (Vitamin B2) is an essential water-soluble vitamin that plays a key role in energy production, cellular function, and the metabolism of fats, drugs, and steroids. It acts as a precursor to the coenzymes FAD and FMN, which are involved in numerous metabolic reactions including the electron transport chain that generates cellular energy.
Key Highlights
- Contributes to normal energy-yielding metabolism (EFSA approved)
- Supports the reduction of tiredness and fatigue (EFSA approved)
- Contributes to maintenance of normal skin and mucous membranes (EFSA approved)
- Supports maintenance of normal vision (EFSA approved)
- Contributes to protection of cells from oxidative stress (EFSA approved)
- Supports normal functioning of the nervous system (EFSA approved)
- Contributes to normal iron metabolism (EFSA approved)
Biochemistry Timeline
Riboflavin is water-soluble and rapidly absorbed. Blood levels respond within days of supplementation. The bright yellow urine some people notice when taking B vitamins is due to riboflavin and is completely harmless.
Iron Metabolism
Riboflavin contributes to normal iron metabolism, supporting the body's ability to absorb, transport, and utilise iron. This makes it a supportive nutrient alongside iron supplementation, particularly for women at risk of iron deficiency.
Nervous System
Riboflavin contributes to normal functioning of the nervous system. Its role in energy production is particularly important for nerve cells, which have high metabolic demands. Some research has also explored riboflavin's potential role in migraine prevention at higher doses (400 mg/day), though this is beyond standard nutritional supplementation.
Summary
Riboflavin (Vitamin B2) is essential for energy production, skin health, vision, antioxidant protection, and iron metabolism. It is well-absorbed, safe, and the bright yellow urine sometimes caused by B-complex supplements is due to riboflavin and is completely harmless.
FAQs
Why does my urine turn yellow when taking B vitamins?
The bright yellow colour is caused by riboflavin (B2) and is completely normal and harmless. It simply indicates that your body is absorbing the vitamin and excreting the excess.
How much riboflavin do I need?
The recommended daily intake for adults is 1.1-1.4 mg. There is no established upper limit as excess is excreted in urine.
Is riboflavin safe during pregnancy?
Yes, riboflavin is important during pregnancy. Recommended intake is slightly higher during pregnancy and breastfeeding.
Research
Dai L, Wang B, Fan W et al. (2026). Oligomeric ultranano hydrogen water improves flock uniformity, antioxidant capacity and intestinal health in growth phase layer-type chickens. Poult Sci. https://pubmed.ncbi.nlm.nih.gov/41846073/
Tia A, Hauser J, Konan AG et al. (2026). Systematic Review of Nutrients' Impact on Cognition and School Performance in School-Aged Children in Sub-Saharan Africa. Nutr Rev. https://pubmed.ncbi.nlm.nih.gov/41824300/
Beckman KA, Parkhurst GD, Lee JH et al. (2026). Randomized, Controlled Study to Evaluate the Safety and Efficacy of Oxygen-Enriched Epithelium-On Corneal Cross-Linking for the Treatment of Keratoconus. Ophthalmol Ther. https://pubmed.ncbi.nlm.nih.gov/41824263/
Ambrósio JA, Brissos J, Tardão GC et al. (2026). Tomographic and Biomechanical Stability of the Non-operated Eye in Asymmetric Keratoconus with Unilateral Intracorneal Ring Segment Implantation. Ophthalmol Ther. https://pubmed.ncbi.nlm.nih.gov/41811402/
Rapuano CJ, Beckman KA, Rajpal R (2026). The Critical Role of Oxygen Supplementation in Epithelium-On Corneal Cross-Linking: A Narrative Review. Adv Ther [Review]. https://pubmed.ncbi.nlm.nih.gov/41774369/
Quiles-Pérez CJ, Olzak A, Fofana A et al. (2026). Anaerobic riboflavin degradation by human gut Lachnospiraceae. bioRxiv. https://pubmed.ncbi.nlm.nih.gov/41757019/
Ben Hilal H, Zhang J, Liu X et al. (2026). In Vivo Evaluation of Efficacy and Safety of Oxygen-Supplemented Accelerated Scleral Cross-Linking Over Time in Young Rabbits. Transl Vis Sci Technol. https://pubmed.ncbi.nlm.nih.gov/41733420/
Chen Z, Lai L, Lu X et al. (2026). Case Report: SLC52A2 variants cause Brown-Vialetto-Van Laere syndrome type 2, characterized by pure red cell aplastic anemia: clinical and genetic features of three Chinese children. Front Pediatr. https://pubmed.ncbi.nlm.nih.gov/41727768/
Lim RR, Zhao E, Hass DT et al. (2026). Nutrient microenvironments reprogram RPE metabolism. bioRxiv. https://pubmed.ncbi.nlm.nih.gov/41727089/
Shabbir U, McNulty H, Hughes C et al. (2026). B vitamins, immune function and the ageing brain: a critical review of the evidence, mechanisms and potential role of the gut microbiome. Proc Nutr Soc [Review]. https://pubmed.ncbi.nlm.nih.gov/41693429/
Bjørke-Monsen AL, Torsvik IK, Bentsen MHL et al. (2026). Exclusive Breastfeeding Is Not Ensuring an Adequate Vitamin B Status in Premature Infants with Very Low Birth Weight. Nutrients. https://pubmed.ncbi.nlm.nih.gov/41683246/
Işık T, Garipağaoğlu M (2026). Assessment of the nutritional status of Syrian refugee women in the lactation period. Nutr Health. https://pubmed.ncbi.nlm.nih.gov/41662259/
Zhao Z, Shi S, Zhang L et al. (2026). Metabolic modulation of yogurt fermentation kinetics and acidification by Bifidobacterium-starter culture interactions. Front Microbiol. https://pubmed.ncbi.nlm.nih.gov/41657908/
Nordin BA (2026). Comparative Efficacy and Safety of Conventional Dresden, Transepithelial, and Accelerated Corneal Collagen Cross-Linking Protocols for Progressive Keratoconus: A Systematic Review. Cureus [Review]. https://pubmed.ncbi.nlm.nih.gov/41641181/
Jaruseviciene R, Tamuleviciute R, Galgauskas S (2026). Corneal Cross-Linking in Keratoconus: Comparative Analysis of Standard, Accelerated and Transepithelial Protocols. J Clin Med [Review]. https://pubmed.ncbi.nlm.nih.gov/41598429/
Tong T, Huang X, Li L et al. (2026). Microbial metabolite FAD mobilizes adipocyte lipid remodeling to enhance cancer immunotherapy efficacy. Cell Metab. https://pubmed.ncbi.nlm.nih.gov/41570815/
Duffy B, Patted A, Boelig RC et al. (2025). Can riboflavin offer a novel personalised strategy for maintaining healthy blood pressure in pregnancy in populations globally?. BMJ Nutr Prev Health [Review]. https://pubmed.ncbi.nlm.nih.gov/41768514/
Rocchetti G, Catellani A, Lapris M et al. (2025). Plasma Metabolomics Reveals Systemic Metabolic Remodeling in Early-Lactation Dairy Cows Fed a Fusarium-Contaminated Diet and Supplemented with a Mycotoxin-Deactivating Product. Toxins (Basel). https://pubmed.ncbi.nlm.nih.gov/41591156/
Feely J, Saliba N, Nze N et al. (2025). Progressive Weakness in Adulthood: Lipid Storage Myopathy With Suspected Sertraline-Associated Etiology. Cureus. https://pubmed.ncbi.nlm.nih.gov/41555972/
Wang Q, Zhang N, Sun L et al. (2025). Riboflavin Increases Goat Sperm Motility via Enhancement of Mitochondrial β-Oxidation. Biology (Basel). https://pubmed.ncbi.nlm.nih.gov/41514925/
20 studies — Vitamin B2
Dai L, Wang B, Fan W et al. (2026). Oligomeric ultranano hydrogen water improves flock uniformity, antioxidant capacity and intestinal health in growth phase layer-type chickens. Poult Sci. https://pubmed.ncbi.nlm.nih.gov/41846073/
Tia A, Hauser J, Konan AG et al. (2026). Systematic Review of Nutrients' Impact on Cognition and School Performance in School-Aged Children in Sub-Saharan Africa. Nutr Rev. https://pubmed.ncbi.nlm.nih.gov/41824300/
Beckman KA, Parkhurst GD, Lee JH et al. (2026). Randomized, Controlled Study to Evaluate the Safety and Efficacy of Oxygen-Enriched Epithelium-On Corneal Cross-Linking for the Treatment of Keratoconus. Ophthalmol Ther. https://pubmed.ncbi.nlm.nih.gov/41824263/
Ambrósio JA, Brissos J, Tardão GC et al. (2026). Tomographic and Biomechanical Stability of the Non-operated Eye in Asymmetric Keratoconus with Unilateral Intracorneal Ring Segment Implantation. Ophthalmol Ther. https://pubmed.ncbi.nlm.nih.gov/41811402/
Rapuano CJ, Beckman KA, Rajpal R (2026). The Critical Role of Oxygen Supplementation in Epithelium-On Corneal Cross-Linking: A Narrative Review. Adv Ther [Review]. https://pubmed.ncbi.nlm.nih.gov/41774369/
Quiles-Pérez CJ, Olzak A, Fofana A et al. (2026). Anaerobic riboflavin degradation by human gut Lachnospiraceae. bioRxiv. https://pubmed.ncbi.nlm.nih.gov/41757019/
Ben Hilal H, Zhang J, Liu X et al. (2026). In Vivo Evaluation of Efficacy and Safety of Oxygen-Supplemented Accelerated Scleral Cross-Linking Over Time in Young Rabbits. Transl Vis Sci Technol. https://pubmed.ncbi.nlm.nih.gov/41733420/
Chen Z, Lai L, Lu X et al. (2026). Case Report: SLC52A2 variants cause Brown-Vialetto-Van Laere syndrome type 2, characterized by pure red cell aplastic anemia: clinical and genetic features of three Chinese children. Front Pediatr. https://pubmed.ncbi.nlm.nih.gov/41727768/
Lim RR, Zhao E, Hass DT et al. (2026). Nutrient microenvironments reprogram RPE metabolism. bioRxiv. https://pubmed.ncbi.nlm.nih.gov/41727089/
Shabbir U, McNulty H, Hughes C et al. (2026). B vitamins, immune function and the ageing brain: a critical review of the evidence, mechanisms and potential role of the gut microbiome. Proc Nutr Soc [Review]. https://pubmed.ncbi.nlm.nih.gov/41693429/
Bjørke-Monsen AL, Torsvik IK, Bentsen MHL et al. (2026). Exclusive Breastfeeding Is Not Ensuring an Adequate Vitamin B Status in Premature Infants with Very Low Birth Weight. Nutrients. https://pubmed.ncbi.nlm.nih.gov/41683246/
Işık T, Garipağaoğlu M (2026). Assessment of the nutritional status of Syrian refugee women in the lactation period. Nutr Health. https://pubmed.ncbi.nlm.nih.gov/41662259/
Zhao Z, Shi S, Zhang L et al. (2026). Metabolic modulation of yogurt fermentation kinetics and acidification by Bifidobacterium-starter culture interactions. Front Microbiol. https://pubmed.ncbi.nlm.nih.gov/41657908/
Nordin BA (2026). Comparative Efficacy and Safety of Conventional Dresden, Transepithelial, and Accelerated Corneal Collagen Cross-Linking Protocols for Progressive Keratoconus: A Systematic Review. Cureus [Review]. https://pubmed.ncbi.nlm.nih.gov/41641181/
Jaruseviciene R, Tamuleviciute R, Galgauskas S (2026). Corneal Cross-Linking in Keratoconus: Comparative Analysis of Standard, Accelerated and Transepithelial Protocols. J Clin Med [Review]. https://pubmed.ncbi.nlm.nih.gov/41598429/
Tong T, Huang X, Li L et al. (2026). Microbial metabolite FAD mobilizes adipocyte lipid remodeling to enhance cancer immunotherapy efficacy. Cell Metab. https://pubmed.ncbi.nlm.nih.gov/41570815/
Duffy B, Patted A, Boelig RC et al. (2025). Can riboflavin offer a novel personalised strategy for maintaining healthy blood pressure in pregnancy in populations globally?. BMJ Nutr Prev Health [Review]. https://pubmed.ncbi.nlm.nih.gov/41768514/
Rocchetti G, Catellani A, Lapris M et al. (2025). Plasma Metabolomics Reveals Systemic Metabolic Remodeling in Early-Lactation Dairy Cows Fed a Fusarium-Contaminated Diet and Supplemented with a Mycotoxin-Deactivating Product. Toxins (Basel). https://pubmed.ncbi.nlm.nih.gov/41591156/
Feely J, Saliba N, Nze N et al. (2025). Progressive Weakness in Adulthood: Lipid Storage Myopathy With Suspected Sertraline-Associated Etiology. Cureus. https://pubmed.ncbi.nlm.nih.gov/41555972/
Wang Q, Zhang N, Sun L et al. (2025). Riboflavin Increases Goat Sperm Motility via Enhancement of Mitochondrial β-Oxidation. Biology (Basel). https://pubmed.ncbi.nlm.nih.gov/41514925/
The Benefits of Niacin
Stable form
Niacin (Vitamin B3) is an essential water-soluble vitamin that plays a central role in energy metabolism. It is a precursor to NAD and NADP, two coenzymes involved in over 400 enzymatic reactions in the body. Niacin supports energy production, DNA repair, skin health, and nervous system function.
Key Highlights
- Contributes to normal energy-yielding metabolism (EFSA approved)
- Supports the reduction of tiredness and fatigue (EFSA approved)
- Contributes to maintenance of normal skin and mucous membranes (EFSA approved)
- Supports normal psychological function (EFSA approved)
- Contributes to normal functioning of the nervous system (EFSA approved)
- NAD/NADP coenzymes involved in over 400 enzymatic reactions
Biochemistry Timeline
Niacin is water-soluble and quickly absorbed. Blood levels respond within days. Note: nicotinic acid (one form of niacin) can cause a harmless "flush" (warmth, redness of skin) at higher doses. Nicotinamide does not cause this effect.
DNA Repair and Cellular Health
NAD plays a role in DNA repair through enzymes called PARPs (poly ADP-ribose polymerases) and sirtuins. These pathways are increasingly recognised as important for cellular maintenance and longevity. Adequate niacin intake supports the body's ability to repair DNA damage from normal metabolic processes and environmental exposures.
Cardiovascular Support
High-dose nicotinic acid has been used clinically to support healthy cholesterol levels. However, this is a pharmaceutical application at doses well above nutritional supplementation and should only be used under medical supervision. At nutritional doses, niacin supports overall cardiovascular health through its role in energy metabolism and cellular function.
Summary
Niacin (Vitamin B3) is a versatile vitamin whose coenzyme forms (NAD, NADP) are involved in over 400 reactions. It supports energy metabolism, skin health, nervous system function, and DNA repair. EFSA recognises multiple health claims including contributions to energy metabolism, tiredness reduction, skin maintenance, and psychological function.
FAQs
What is the "niacin flush"?
Nicotinic acid can cause a harmless temporary warmth and redness of the skin. This is called the niacin flush and is not dangerous. Nicotinamide (niacinamide) does not cause this effect.
How much niacin do I need?
The recommended daily intake for adults is 13-16 mg NE (niacin equivalents). The European upper limit for nicotinic acid is 10 mg/day; for nicotinamide it is 900 mg/day.
Is niacin safe during pregnancy?
Yes, niacin is essential during pregnancy. Recommended intake is slightly higher during pregnancy.
Research
Højfeldt G, Michaud J, Damgaard A et al. (2026). Nicotinamide and Pyridoxine Supplementation Enhances Muscle Stem Cell Activity and Muscle Regeneration in Humans: A Randomized Placebo-Controlled Clinical Trial of High Force Eccentric Contraction Recovery in Healthy Young Men. Adv Sci (Weinh). https://pubmed.ncbi.nlm.nih.gov/41874466/
Berven H, Svensen M, Eikeland H et al. (2026). The NAD-brain pharmacokinetic study of NAD augmentation in blood and brain using oral precursor supplementation. iScience. https://pubmed.ncbi.nlm.nih.gov/41858901/
Li Y, Bao T, Gao L et al. (2026). Aging Triggers an Intestinal Energy Crisis and HDL3 Deficiency Disrupting Gut-Liver Axis Homeostasis. Aging Cell. https://pubmed.ncbi.nlm.nih.gov/41851037/
Sayles NM, Casalena G, Zhao D et al. (2026). Pregnancy precipitates metabolic imbalance and accelerates death in an animal model of mitochondrial cardiomyopathy. Mol Metab. https://pubmed.ncbi.nlm.nih.gov/41850395/
Qian X, Xu L, Zheng Y et al. (2026). Senescence-associated metabolic alterations aggravate calcific aortic valve disease. Eur Heart J. https://pubmed.ncbi.nlm.nih.gov/41841768/
Zhang F, Zhang H, Wang P et al. (2026). The NAD salvage pathway enzyme NMNAT-C sustains dark-phase NAD+ homeostasis in cyanobacteria. Plant Physiol. https://pubmed.ncbi.nlm.nih.gov/41838801/
Bai Y, Zhou Y, Wang G et al. (2026). Niacin Mitigates Cyclophosphamide-Induced Immunosuppression by Maintaining Intestinal Homeostasis and Regulating the HCAR2/NLRP3 and PTGS2/PGE2 Signaling Pathways. Nutrients. https://pubmed.ncbi.nlm.nih.gov/41829914/
Granvillano G, Mercogliano M, Vecchietti A et al. (2026). An Umbrella Review on the Prevention of Skin Diseases: Do Specific Nutrients Play a Protective Role?. Prev Nutr Food Sci [Review]. https://pubmed.ncbi.nlm.nih.gov/41815197/
Carpenter BJ, Lecacheur M, Mangold YN et al. (2026). NAD(+) controls circadian rhythmicity during cardiac aging. Commun Biol. https://pubmed.ncbi.nlm.nih.gov/41813966/
Pei Z, Liang F, Wang X et al. (2026). NAD⁺ as a central metabolic hub Regulating the hallmarks of aging: Mechanisms and therapeutic implications. Mech Ageing Dev. https://pubmed.ncbi.nlm.nih.gov/41812700/
Huang J, Qin Q, Li X et al. (2026). Bacteroides-associated NAD⁺ depletion correlates with exacerbated radiation-induced colorectal injury and impaired mucosal proliferative capacity. Gut Microbes. https://pubmed.ncbi.nlm.nih.gov/41807298/
Zhou H, Zhao X, Li Y et al. (2026). Nicotinamide mononucleotide supplementation modulates gut microbiota and metabolites to mitigate Alzheimer's disease pathology in APP/PS1 mice. J Alzheimers Dis. https://pubmed.ncbi.nlm.nih.gov/41805251/
Zhou E, Zhao H, Yu Y et al. (2026). Combined exposure of cold and hypoxia: a driver for hypertension and the underlying role of the microbiota-gut-brain axis. J Hypertens. https://pubmed.ncbi.nlm.nih.gov/41800819/
Huang Y, Zhao E, Zhao G et al. (2026). H3K18 lactylation-mediated SPHK1-SIRT1 feedback loop accelerates pyroptosis of tubular epithelial cells in sepsis-associated acute kidney injury. Theranostics. https://pubmed.ncbi.nlm.nih.gov/41799201/
Dong M, Zhang Q, Wang Y et al. (2026). Restructuring tilth layers suppresses cotton Verticillium wilt through the niacinamide-mediated enrichment of beneficial Pseudomonas. Microbiol Res. https://pubmed.ncbi.nlm.nih.gov/41793890/
Saida M, Saeki N, Sakai H et al. (2026). β-Nicotinamide mononucleotide preserves muscle strength in septic male mice. Sci Rep. https://pubmed.ncbi.nlm.nih.gov/41792260/
Kim JH, Park SJ, Lee JA et al. (2026). PRPS1 (p.V42L) Mutation in Arts Syndrome Induces Aberrant Neural Stem Cell Development and Neuronal Senescence-Like Phenotype: Rescue by Nicotinamide Mononucleotide Supplementation. Int J Stem Cells. https://pubmed.ncbi.nlm.nih.gov/41787648/
Zhou Y, Wu X, Xu X et al. (2026). Sirt1-eIF2α axis drives pro-inflammatory macrophage activation through ER stress aggravating liver IRI in aged mice. Biochem Biophys Res Commun. https://pubmed.ncbi.nlm.nih.gov/41775225/
Zhang D, Li Z, Meng X et al. (2026). Nicotinamide Mononucleotide Decreases Secretion of Proinflammatory Cytokines via the NAD (+) /SIRT1/p65 Axis. ACS Omega. https://pubmed.ncbi.nlm.nih.gov/41768621/
Jin X, Luo X, Shen W et al. (2026). Nicotinamide Riboside Alleviates Heat Stress-Induced Intestinal Dysfunction by Enhancing Antioxidant Capacity, Restoring Immune Homeostasis, and Modulating Gut Microbiota in a Boar Model. Mol Nutr Food Res. https://pubmed.ncbi.nlm.nih.gov/41761881/
20 studies — Niacin
Højfeldt G, Michaud J, Damgaard A et al. (2026). Nicotinamide and Pyridoxine Supplementation Enhances Muscle Stem Cell Activity and Muscle Regeneration in Humans: A Randomized Placebo-Controlled Clinical Trial of High Force Eccentric Contraction Recovery in Healthy Young Men. Adv Sci (Weinh). https://pubmed.ncbi.nlm.nih.gov/41874466/
Berven H, Svensen M, Eikeland H et al. (2026). The NAD-brain pharmacokinetic study of NAD augmentation in blood and brain using oral precursor supplementation. iScience. https://pubmed.ncbi.nlm.nih.gov/41858901/
Li Y, Bao T, Gao L et al. (2026). Aging Triggers an Intestinal Energy Crisis and HDL3 Deficiency Disrupting Gut-Liver Axis Homeostasis. Aging Cell. https://pubmed.ncbi.nlm.nih.gov/41851037/
Sayles NM, Casalena G, Zhao D et al. (2026). Pregnancy precipitates metabolic imbalance and accelerates death in an animal model of mitochondrial cardiomyopathy. Mol Metab. https://pubmed.ncbi.nlm.nih.gov/41850395/
Qian X, Xu L, Zheng Y et al. (2026). Senescence-associated metabolic alterations aggravate calcific aortic valve disease. Eur Heart J. https://pubmed.ncbi.nlm.nih.gov/41841768/
Zhang F, Zhang H, Wang P et al. (2026). The NAD salvage pathway enzyme NMNAT-C sustains dark-phase NAD+ homeostasis in cyanobacteria. Plant Physiol. https://pubmed.ncbi.nlm.nih.gov/41838801/
Bai Y, Zhou Y, Wang G et al. (2026). Niacin Mitigates Cyclophosphamide-Induced Immunosuppression by Maintaining Intestinal Homeostasis and Regulating the HCAR2/NLRP3 and PTGS2/PGE2 Signaling Pathways. Nutrients. https://pubmed.ncbi.nlm.nih.gov/41829914/
Granvillano G, Mercogliano M, Vecchietti A et al. (2026). An Umbrella Review on the Prevention of Skin Diseases: Do Specific Nutrients Play a Protective Role?. Prev Nutr Food Sci [Review]. https://pubmed.ncbi.nlm.nih.gov/41815197/
Carpenter BJ, Lecacheur M, Mangold YN et al. (2026). NAD(+) controls circadian rhythmicity during cardiac aging. Commun Biol. https://pubmed.ncbi.nlm.nih.gov/41813966/
Pei Z, Liang F, Wang X et al. (2026). NAD⁺ as a central metabolic hub Regulating the hallmarks of aging: Mechanisms and therapeutic implications. Mech Ageing Dev. https://pubmed.ncbi.nlm.nih.gov/41812700/
Huang J, Qin Q, Li X et al. (2026). Bacteroides-associated NAD⁺ depletion correlates with exacerbated radiation-induced colorectal injury and impaired mucosal proliferative capacity. Gut Microbes. https://pubmed.ncbi.nlm.nih.gov/41807298/
Zhou H, Zhao X, Li Y et al. (2026). Nicotinamide mononucleotide supplementation modulates gut microbiota and metabolites to mitigate Alzheimer's disease pathology in APP/PS1 mice. J Alzheimers Dis. https://pubmed.ncbi.nlm.nih.gov/41805251/
Zhou E, Zhao H, Yu Y et al. (2026). Combined exposure of cold and hypoxia: a driver for hypertension and the underlying role of the microbiota-gut-brain axis. J Hypertens. https://pubmed.ncbi.nlm.nih.gov/41800819/
Huang Y, Zhao E, Zhao G et al. (2026). H3K18 lactylation-mediated SPHK1-SIRT1 feedback loop accelerates pyroptosis of tubular epithelial cells in sepsis-associated acute kidney injury. Theranostics. https://pubmed.ncbi.nlm.nih.gov/41799201/
Dong M, Zhang Q, Wang Y et al. (2026). Restructuring tilth layers suppresses cotton Verticillium wilt through the niacinamide-mediated enrichment of beneficial Pseudomonas. Microbiol Res. https://pubmed.ncbi.nlm.nih.gov/41793890/
Saida M, Saeki N, Sakai H et al. (2026). β-Nicotinamide mononucleotide preserves muscle strength in septic male mice. Sci Rep. https://pubmed.ncbi.nlm.nih.gov/41792260/
Kim JH, Park SJ, Lee JA et al. (2026). PRPS1 (p.V42L) Mutation in Arts Syndrome Induces Aberrant Neural Stem Cell Development and Neuronal Senescence-Like Phenotype: Rescue by Nicotinamide Mononucleotide Supplementation. Int J Stem Cells. https://pubmed.ncbi.nlm.nih.gov/41787648/
Zhou Y, Wu X, Xu X et al. (2026). Sirt1-eIF2α axis drives pro-inflammatory macrophage activation through ER stress aggravating liver IRI in aged mice. Biochem Biophys Res Commun. https://pubmed.ncbi.nlm.nih.gov/41775225/
Zhang D, Li Z, Meng X et al. (2026). Nicotinamide Mononucleotide Decreases Secretion of Proinflammatory Cytokines via the NAD (+) /SIRT1/p65 Axis. ACS Omega. https://pubmed.ncbi.nlm.nih.gov/41768621/
Jin X, Luo X, Shen W et al. (2026). Nicotinamide Riboside Alleviates Heat Stress-Induced Intestinal Dysfunction by Enhancing Antioxidant Capacity, Restoring Immune Homeostasis, and Modulating Gut Microbiota in a Boar Model. Mol Nutr Food Res. https://pubmed.ncbi.nlm.nih.gov/41761881/
The Benefits of Vitamin B6
Hormonal Balance
Vitamin B6 (Pyridoxine) is an essential water-soluble vitamin involved in over 100 enzyme reactions in the body. It is particularly important for protein metabolism, neurotransmitter production, immune function, and hormonal balance. B6 plays a central role in producing the neurotransmitters serotonin, dopamine, and GABA, making it key for mood and nervous system health.
Key Highlights
- Contributes to the regulation of hormonal activity (EFSA approved)
- Supports normal psychological function (EFSA approved)
- Contributes to normal functioning of the nervous system (EFSA approved)
- Supports normal energy-yielding metabolism (EFSA approved)
- Contributes to the reduction of tiredness and fatigue (EFSA approved)
- Supports normal function of the immune system (EFSA approved)
- Contributes to normal red blood cell formation (EFSA approved)
Biochemistry Timeline
B6 is water-soluble and blood levels respond quickly to supplementation, typically within 1 to 2 weeks. For PMS-related benefits, supplementation throughout the cycle (or at least during the luteal phase) for 2 to 3 cycles is typically recommended to assess effectiveness.
The European upper limit for supplemental B6 is 25 mg per day for long-term use, though short-term higher doses have been used in clinical studies. Very high doses over prolonged periods can cause nerve-related side effects, so moderate, consistent intake is preferred.
Protein and Amino Acid Metabolism
B6's involvement in over 100 enzyme reactions relates primarily to amino acid metabolism. It is essential for the transamination, decarboxylation, and deamination of amino acids, which are fundamental processes for protein utilisation in the body.
This makes B6 particularly important for those with higher protein intakes or increased metabolic demands. EFSA recognises that vitamin B6 contributes to normal protein and glycogen metabolism.
Homocysteine Metabolism
Together with folate and B12, vitamin B6 helps metabolise homocysteine, an amino acid that at elevated levels is associated with cardiovascular risk. B6 converts homocysteine via an alternative pathway (transsulfuration to cysteine), complementing the folate/B12 methylation pathway.
EFSA recognises that vitamin B6 contributes to normal homocysteine metabolism. Maintaining adequate B6, B12, and folate levels together provides comprehensive homocysteine management.
Summary
Vitamin B6 is a versatile water-soluble vitamin essential for neurotransmitter production, hormonal balance, immune function, and energy metabolism. It is particularly valued in women's health for its role in managing PMS symptoms and supporting mood through serotonin and dopamine production.
EFSA recognises B6's contribution to hormonal regulation, psychological function, nervous system health, energy metabolism, and immune function. Regular intake is important as the body does not store B6, and benefits for PMS typically require 2 to 3 cycles of consistent supplementation.
FAQs
How much vitamin B6 do I need?
The recommended daily intake for adults is 1.2-1.4 mg. For PMS support, research has used 50-100 mg/day. The European upper limit for long-term use is 25 mg/day. Higher therapeutic doses should be used under guidance.
Can B6 help with morning sickness?
Vitamin B6 has been studied for pregnancy-related nausea and is considered safe during pregnancy. Some healthcare providers recommend it as a first-line approach for mild morning sickness. Consult your healthcare provider for appropriate dosing.
Are there side effects from too much B6?
Very high doses (above 200 mg/day) taken for extended periods can cause peripheral neuropathy (nerve damage causing numbness and tingling). This is reversible upon stopping. Moderate supplementation within guidelines is safe.
Is B6 safe during pregnancy?
Yes, B6 is important during pregnancy. It supports fetal brain development and may help with nausea. Follow your healthcare provider's guidance on dosage.
Research
Liu X et al. – The journal of prevention of Alzheimer's disease (2026). [Review]. https://pubmed.ncbi.nlm.nih.gov/41764841/
Althubity AA – Molecular medicine reports (2026). [Review]. https://pubmed.ncbi.nlm.nih.gov/41235668/
Alvarez M et al. – Current nutrition reports (2026). [Review]. https://pubmed.ncbi.nlm.nih.gov/41609902/
Tariq L et al. – Physiologia plantarum (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/40671330/
Qin Y et al. – Frontiers in endocrinology (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/41127511/
Banan Khojasteh MH et al. – Critical reviews in food science and nutrition (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/39115011/
Banihani SA – The world journal of men's health (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/40583024/
Chang J et al. – European journal of nutrition (2024). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/38300291/
Giuca MR – European journal of paediatric dentistry (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/39212455/
Xu Q et al. – Zhonghua wei zhong bing ji jiu yi xue (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/39697032/
Jayawardena R et al. – Archives of gynecology and obstetrics (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/36719452/
Muhamad R et al. – Nutrients (2023). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/37447150/
C Curtin A et al. – Journal of dietary supplements (2023). [RCT]. https://pubmed.ncbi.nlm.nih.gov/35109763/
Godfrey KM et al. – PLoS medicine (2023). [RCT]. https://pubmed.ncbi.nlm.nih.gov/38051700/
Hersant H et al. – CNS drugs (2023). [Review]. https://pubmed.ncbi.nlm.nih.gov/37603263/
Choi SW et al. – Nutrition research and practice (2023). [Review]. https://pubmed.ncbi.nlm.nih.gov/37529262/
Munteanu C et al. – Nutrients (2023). [Review]. https://pubmed.ncbi.nlm.nih.gov/38201854/
Field DT et al. – Human psychopharmacology (2022). [RCT]. https://pubmed.ncbi.nlm.nih.gov/35851507/
Ettinger S – Current nutrition reports (2022). [Review]. https://pubmed.ncbi.nlm.nih.gov/36018501/
Bossard V et al. – Nutrition (Burbank, Los Angeles County, Calif.) (2022). [Review]. https://pubmed.ncbi.nlm.nih.gov/35810581/
Stach K et al. – Nutrients (2021). [Review]. https://pubmed.ncbi.nlm.nih.gov/34579110/
Behrens A et al. – Systematic reviews (2020). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/32414424/
Khorasani F et al. – Journal of obstetrics and gynaecology : the journal of the Institute of Obstetrics and Gynaecology (2020). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/31215276/
Reininghaus EZ et al. – Nutrients (2020). [RCT]. https://pubmed.ncbi.nlm.nih.gov/33171595/
Wallace TC et al. – Journal of nutrition in gerontology and geriatrics (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/31502930/
Wilson MP et al. – Journal of inherited metabolic disease (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/30671974/
Boelig RC et al. – The Cochrane database of systematic reviews (2016). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/27168518/
McParlin C et al. – JAMA (2016). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/27701665/
O'Donnell A et al. – Health technology assessment (Winchester, England) (2016). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/27731292/
Jewell D et al. – The Cochrane database of systematic reviews (2010). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/20824826/
Piazzini DB et al. – Clinical rehabilitation (2007). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/17613571/
Goodyear-Smith F et al. – Annals of family medicine (2004). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/15209206/
O'Connor D et al. – The Cochrane database of systematic reviews (2003). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/12535461/
Jewell D et al. – The Cochrane database of systematic reviews (2003). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/14583914/
De Souza MC et al. – Journal of women's health & gender-based medicine (2000). [RCT]. https://pubmed.ncbi.nlm.nih.gov/10746516/
Macdougall M – The Western journal of medicine (2000). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/10778376/
Kleijnen J et al. – Biological psychiatry (1991). [Review]. https://pubmed.ncbi.nlm.nih.gov/1828703/
37 studies — Vitamin B6
Liu X et al. – The journal of prevention of Alzheimer's disease (2026). [Review]. https://pubmed.ncbi.nlm.nih.gov/41764841/
Althubity AA – Molecular medicine reports (2026). [Review]. https://pubmed.ncbi.nlm.nih.gov/41235668/
Alvarez M et al. – Current nutrition reports (2026). [Review]. https://pubmed.ncbi.nlm.nih.gov/41609902/
Tariq L et al. – Physiologia plantarum (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/40671330/
Qin Y et al. – Frontiers in endocrinology (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/41127511/
Banan Khojasteh MH et al. – Critical reviews in food science and nutrition (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/39115011/
Banihani SA – The world journal of men's health (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/40583024/
Chang J et al. – European journal of nutrition (2024). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/38300291/
Giuca MR – European journal of paediatric dentistry (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/39212455/
Xu Q et al. – Zhonghua wei zhong bing ji jiu yi xue (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/39697032/
Jayawardena R et al. – Archives of gynecology and obstetrics (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/36719452/
Muhamad R et al. – Nutrients (2023). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/37447150/
C Curtin A et al. – Journal of dietary supplements (2023). [RCT]. https://pubmed.ncbi.nlm.nih.gov/35109763/
Godfrey KM et al. – PLoS medicine (2023). [RCT]. https://pubmed.ncbi.nlm.nih.gov/38051700/
Hersant H et al. – CNS drugs (2023). [Review]. https://pubmed.ncbi.nlm.nih.gov/37603263/
Choi SW et al. – Nutrition research and practice (2023). [Review]. https://pubmed.ncbi.nlm.nih.gov/37529262/
Munteanu C et al. – Nutrients (2023). [Review]. https://pubmed.ncbi.nlm.nih.gov/38201854/
Field DT et al. – Human psychopharmacology (2022). [RCT]. https://pubmed.ncbi.nlm.nih.gov/35851507/
Ettinger S – Current nutrition reports (2022). [Review]. https://pubmed.ncbi.nlm.nih.gov/36018501/
Bossard V et al. – Nutrition (Burbank, Los Angeles County, Calif.) (2022). [Review]. https://pubmed.ncbi.nlm.nih.gov/35810581/
Stach K et al. – Nutrients (2021). [Review]. https://pubmed.ncbi.nlm.nih.gov/34579110/
Behrens A et al. – Systematic reviews (2020). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/32414424/
Khorasani F et al. – Journal of obstetrics and gynaecology : the journal of the Institute of Obstetrics and Gynaecology (2020). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/31215276/
Reininghaus EZ et al. – Nutrients (2020). [RCT]. https://pubmed.ncbi.nlm.nih.gov/33171595/
Wallace TC et al. – Journal of nutrition in gerontology and geriatrics (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/31502930/
Wilson MP et al. – Journal of inherited metabolic disease (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/30671974/
Boelig RC et al. – The Cochrane database of systematic reviews (2016). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/27168518/
McParlin C et al. – JAMA (2016). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/27701665/
O'Donnell A et al. – Health technology assessment (Winchester, England) (2016). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/27731292/
Jewell D et al. – The Cochrane database of systematic reviews (2010). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/20824826/
Piazzini DB et al. – Clinical rehabilitation (2007). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/17613571/
Goodyear-Smith F et al. – Annals of family medicine (2004). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/15209206/
O'Connor D et al. – The Cochrane database of systematic reviews (2003). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/12535461/
Jewell D et al. – The Cochrane database of systematic reviews (2003). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/14583914/
De Souza MC et al. – Journal of women's health & gender-based medicine (2000). [RCT]. https://pubmed.ncbi.nlm.nih.gov/10746516/
Macdougall M – The Western journal of medicine (2000). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/10778376/
Kleijnen J et al. – Biological psychiatry (1991). [Review]. https://pubmed.ncbi.nlm.nih.gov/1828703/
The Benefits of Folic Acid
Stable form
Folic acid (Vitamin B9) is essential for cell division, DNA synthesis, and the formation of red blood cells. It is perhaps best known for its critical role during pregnancy in preventing neural tube defects, but its benefits extend throughout life, supporting cognitive health, mood, and cardiovascular wellness through homocysteine metabolism.
Key Highlights
- Supplemental folic acid increases maternal folate status; low status is a risk factor for neural tube defects (EFSA approved)
- Contributes to maternal tissue growth during pregnancy (EFSA approved)
- Supports normal blood formation (EFSA approved)
- Contributes to normal amino acid synthesis (EFSA approved)
- Supports normal psychological function (EFSA approved)
- Contributes to the reduction of tiredness and fatigue (EFSA approved)
- Has a role in the process of cell division (EFSA approved)
Biochemistry Timeline
Folate is water-soluble, so blood levels respond relatively quickly to supplementation, typically increasing within 1 to 2 weeks. For pregnancy-related benefits, supplementation should begin at least 1 month before conception, as the neural tube forms within the first 28 days.
For cognitive benefits, the FACIT trial used 3 years of supplementation, suggesting that long-term consistent intake is most beneficial for brain health. Improvements in anaemia-related fatigue may be noticed within 4 to 8 weeks.
Homocysteine Metabolism
Folate, together with vitamins B12 and B6, plays a key role in metabolising homocysteine, an amino acid that at elevated levels is associated with increased cardiovascular risk and cognitive decline.
EFSA recognises that folate contributes to normal homocysteine metabolism. By helping convert homocysteine to methionine, folate supports cardiovascular health and provides the methylation substrates needed for numerous biological processes. Maintaining adequate folate, B12, and B6 levels is one of the most practical ways to keep homocysteine in a healthy range.
Immune Function
Folate supports the normal function of the immune system, an EFSA-approved health claim. It is needed for the rapid cell division that occurs when the immune system mounts a response to infection, including the production of white blood cells and antibodies.
Adequate folate intake ensures that the immune system can respond effectively when needed. This is particularly relevant during pregnancy, when immune demands increase alongside the already elevated folate requirements for fetal development.
Summary
Folic acid (Vitamin B9) is essential for cell division, DNA synthesis, red blood cell formation, and cognitive health. Its most critical role is in preventing neural tube defects during early pregnancy, which is why supplementation is recommended for all women of childbearing age.
Beyond pregnancy, folate supports cognitive function (with research showing reduced dementia risk), homocysteine metabolism, immune function, and energy levels. In Denmark, where food is not fortified with folic acid, awareness of dietary intake and supplementation is particularly important.
FAQs
When should I start taking folic acid before pregnancy?
The Danish Health Authority recommends starting folic acid supplementation at least 1 month before conception and continuing through the first 12 weeks of pregnancy. Since many pregnancies are unplanned, all women of childbearing age who might become pregnant are advised to maintain adequate folate intake.
What is the difference between folate and folic acid?
Folate is the natural form found in food. Folic acid is the synthetic form used in supplements and food fortification. Both are converted to the active form (5-MTHF) in the body. Some people with MTHFR gene variants may process folic acid less efficiently and benefit from methylfolate (5-MTHF) supplements instead.
How much folic acid do I need?
The recommended daily intake for adults is 200-400 µg. For women planning pregnancy, 400 µg of supplemental folic acid is recommended. The European upper limit for supplemental folic acid is 1,000 µg per day.
Can men benefit from folic acid?
Yes, folate supports cognitive health, homocysteine metabolism, and cell division in everyone. It is important for both men and women, though the specific pregnancy-related benefits apply to women.
Are there any side effects?
Folic acid is generally well-tolerated. Very high doses can mask B12 deficiency symptoms, which is why supplementation should be balanced and not exceed recommended levels without medical guidance.
Research
Guo L et al. – Annals of medicine (2026). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/41615824/
Lin H et al. – Hormone and metabolic research = Hormon- und Stoffwechselforschung = Hormones et metabolisme (2026). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/41617174/
Campisi M et al. – Advances in nutrition (Bethesda, Md.) (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/40975498/
Tavares Rodrigues LP et al. – Journal of clinical neuroscience : official journal of the Neurosurgical Society of Australasia (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/40147066/
Soriano-Gonzalez R et al. – Frontiers in nutrition (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/41280388/
Tang X et al. – Journal of the Academy of Nutrition and Dietetics (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/39306086/
Ferrari FA et al. – European journal of surgical oncology : the journal of the European Society of Surgical Oncology and the British Association of Surgical Oncology (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/40344696/
Zhang L et al. – Nutrients (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/39064642/
Seyoum Tola F – Medicine (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/38728462/
Matsuo R et al. – Archives of dermatological research (2024). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/38771513/
Mokgalaboni K et al. – Nutrition & diabetes (2024). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/38649347/
Kukor Z – Nutrients (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/39408215/
Finkelstein JL et al. – The Cochrane database of systematic reviews (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/38189492/
Chang B et al. – Geriatric nursing (New York, N.Y.) (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/36940509/
Habib SS et al. – European review for medical and pharmacological sciences (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/37782175/
Erdoğan K et al. – Journal of nutritional science (2023). [Review]. https://pubmed.ncbi.nlm.nih.gov/37771507/
Nutrition Reviews 2022 - B vitamins dementia MA (2022). [SR + meta-analysis]. https://academic.oup.com/nutritionreviews/article-abstract/80/4/931/6357328
Yuan S et al. – The American journal of clinical nutrition (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/36205540/
Jin X et al. – Journal of affective disorders (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/35066009/
Balandeh E et al. – Neuropsychobiology (2021). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/33744893/
Tsai TY et al. – Journal of the American College of Nutrition (2021). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/32702250/
Hoxha B et al. – Cells (2021). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/34440744/
van der Burg KP et al. – Nutritional neuroscience (2021). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/31397223/
Raghubeer S et al. – Nutrients (2021). [Review]. https://pubmed.ncbi.nlm.nih.gov/34960114/
Zheng W et al. – Journal of affective disorders (2020). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/32063563/
Chapelle N et al. – Gut (2020). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/32989022/
Khan R et al. – Asian journal of psychiatry (2020). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/32403029/
Tsai TY et al. – The British journal of dermatology (2019). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/30074615/
Bulloch RE et al. – Paediatric and perinatal epidemiology (2018). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/29882975/
Toivonen KI et al. – Preventive medicine (2018). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/29802877/
Hiraoka M et al. – Congenital anomalies (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/28598562/
Liew SC et al. – European journal of medical genetics (2015). [Review]. https://pubmed.ncbi.nlm.nih.gov/25449138/
Butali A et al. – Birth defects research. Part A, Clinical and molecular teratology (2013). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/23670871/
Malouf R et al. – The Cochrane database of systematic reviews (2008). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/18843658/
Durga J et al. - The Lancet (FACIT) (2007). [Landmark RCT]. https://pubmed.ncbi.nlm.nih.gov/17240286/
Dose-dependent effects of folic acid on blood concentrations of homocysteine: a (2005). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/16210710/
Donnelly JG – Critical reviews in clinical laboratory sciences (2001). [Review]. https://pubmed.ncbi.nlm.nih.gov/11451208/
Rasmussen LB et al. – Danish medical bulletin (1998). [Review]. https://pubmed.ncbi.nlm.nih.gov/9587705/
38 studies — Folic Acid
Guo L et al. – Annals of medicine (2026). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/41615824/
Lin H et al. – Hormone and metabolic research = Hormon- und Stoffwechselforschung = Hormones et metabolisme (2026). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/41617174/
Campisi M et al. – Advances in nutrition (Bethesda, Md.) (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/40975498/
Tavares Rodrigues LP et al. – Journal of clinical neuroscience : official journal of the Neurosurgical Society of Australasia (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/40147066/
Soriano-Gonzalez R et al. – Frontiers in nutrition (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/41280388/
Tang X et al. – Journal of the Academy of Nutrition and Dietetics (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/39306086/
Ferrari FA et al. – European journal of surgical oncology : the journal of the European Society of Surgical Oncology and the British Association of Surgical Oncology (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/40344696/
Zhang L et al. – Nutrients (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/39064642/
Seyoum Tola F – Medicine (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/38728462/
Matsuo R et al. – Archives of dermatological research (2024). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/38771513/
Mokgalaboni K et al. – Nutrition & diabetes (2024). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/38649347/
Kukor Z – Nutrients (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/39408215/
Finkelstein JL et al. – The Cochrane database of systematic reviews (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/38189492/
Chang B et al. – Geriatric nursing (New York, N.Y.) (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/36940509/
Habib SS et al. – European review for medical and pharmacological sciences (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/37782175/
Erdoğan K et al. – Journal of nutritional science (2023). [Review]. https://pubmed.ncbi.nlm.nih.gov/37771507/
Nutrition Reviews 2022 - B vitamins dementia MA (2022). [SR + meta-analysis]. https://academic.oup.com/nutritionreviews/article-abstract/80/4/931/6357328
Yuan S et al. – The American journal of clinical nutrition (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/36205540/
Jin X et al. – Journal of affective disorders (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/35066009/
Balandeh E et al. – Neuropsychobiology (2021). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/33744893/
Tsai TY et al. – Journal of the American College of Nutrition (2021). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/32702250/
Hoxha B et al. – Cells (2021). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/34440744/
van der Burg KP et al. – Nutritional neuroscience (2021). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/31397223/
Raghubeer S et al. – Nutrients (2021). [Review]. https://pubmed.ncbi.nlm.nih.gov/34960114/
Zheng W et al. – Journal of affective disorders (2020). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/32063563/
Chapelle N et al. – Gut (2020). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/32989022/
Khan R et al. – Asian journal of psychiatry (2020). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/32403029/
Tsai TY et al. – The British journal of dermatology (2019). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/30074615/
Bulloch RE et al. – Paediatric and perinatal epidemiology (2018). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/29882975/
Toivonen KI et al. – Preventive medicine (2018). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/29802877/
Hiraoka M et al. – Congenital anomalies (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/28598562/
Liew SC et al. – European journal of medical genetics (2015). [Review]. https://pubmed.ncbi.nlm.nih.gov/25449138/
Butali A et al. – Birth defects research. Part A, Clinical and molecular teratology (2013). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/23670871/
Malouf R et al. – The Cochrane database of systematic reviews (2008). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/18843658/
Durga J et al. - The Lancet (FACIT) (2007). [Landmark RCT]. https://pubmed.ncbi.nlm.nih.gov/17240286/
Dose-dependent effects of folic acid on blood concentrations of homocysteine: a (2005). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/16210710/
Donnelly JG – Critical reviews in clinical laboratory sciences (2001). [Review]. https://pubmed.ncbi.nlm.nih.gov/11451208/
Rasmussen LB et al. – Danish medical bulletin (1998). [Review]. https://pubmed.ncbi.nlm.nih.gov/9587705/
The Benefits of Vitamin B12
Methylated Form
Vitamin B12 (Methylcobalamin) is essential for energy production, nerve health, and red blood cell formation. It plays a vital role in converting food into energy and maintaining healthy neurological function. B12 is also crucial for DNA synthesis and helps prevent megaloblastic anaemia, a condition that can cause fatigue and weakness due to large, improperly formed red blood cells.
Key Highlights
- Supports normal energy-yielding metabolism (EFSA approved)
- Contributes to the reduction of tiredness and fatigue (EFSA approved)
- Supports normal psychological function (EFSA approved)
- Contributes to normal nervous system function (EFSA approved)
- Supports normal red blood cell formation (EFSA approved)
- Contributes to normal homocysteine metabolism (EFSA approved)
Biochemistry Timeline
Vitamin B12 supplementation may take 4 to 8 weeks to show noticeable benefits, particularly in those with a deficiency. Improvements can include enhanced energy levels, better mood, increased cognitive clarity, and improved nerve function. B12 is stored in the liver, so building up adequate reserves takes time. For those with diagnosed deficiency, healthcare providers may recommend higher initial doses to replenish stores more quickly.
Because B12 is water-soluble, your body uses what it needs and excretes the rest, making it generally well-tolerated even at higher supplementation levels.
Mood and Psychological Function
B12 plays a supportive role in the production of serotonin, often referred to as our "feel-good" neurotransmitter, which is closely linked to mood, emotions, and sleep.
Researchers have found evidence that a decrease in vitamin B12 correlates with an increase in depressive symptoms. One study also suggests that adequate B12 status may be associated with better treatment outcomes for depression (Coppen & Bolander-Gouaille, 2005; Penninx et al., 2000; Syed et al., 2013).
EFSA recognises that vitamin B12 contributes to normal psychological function. While more research is needed to fully understand the relationship between B12 and mood, ensuring adequate intake is a sensible first step towards supporting emotional well-being.
Nerve Health and DNA Synthesis
B12 supports the normal functioning of nerve cells and plays a pivotal role in DNA synthesis. One of its most important functions is aiding in the formation of myelin, the protective sheath that surrounds nerves and facilitates efficient nerve signalling.
When B12 levels are low, myelin production can be disrupted, potentially leading to impaired nervous system function. Neurological symptoms of deficiency can include numbness, tingling, and difficulty with balance (Langan & Goodbred, 2017; O'Leary & Samman, 2010).
EFSA confirms that vitamin B12 contributes to normal functioning of the nervous system and has a role in the process of cell division, which includes DNA synthesis. Ensuring adequate B12 intake is particularly important for maintaining long-term nerve health.
Summary
Vitamin B12 (Methylcobalamin) is crucial for energy production, nerve health, and red blood cell formation. It helps convert food into energy, prevents megaloblastic anaemia, and supports DNA synthesis. Supplementation may take 4 to 8 weeks to show benefits, including improved energy, better mood, clearer thinking, and enhanced nerve function.
B12 is primarily found in animal products, making vegans and vegetarians particularly susceptible to deficiency. Symptoms of low B12 can include fatigue, weakness, and cognitive difficulties. For those at risk, supplementation offers a practical and well-supported way to maintain optimal B12 levels and overall well-being.
FAQs
Who should consider vitamin B12 supplementation?
People at higher risk of deficiency include vegetarians, vegans, older adults, and those with conditions affecting nutrient absorption (such as coeliac disease or Crohn's disease). If you fall into any of these groups, supplementation can be a practical way to maintain adequate levels.
What are the signs of vitamin B12 deficiency?
Common symptoms may include persistent fatigue, weakness, pale skin, numbness or tingling in hands and feet, difficulty with balance, and cognitive difficulties such as poor concentration or memory. If you experience these symptoms, it is worth speaking with your healthcare provider.
Are there any side effects of vitamin B12 supplementation?
Vitamin B12 is generally considered safe and well-tolerated. Because it is water-soluble, excess amounts are typically excreted by the body. In rare cases, very high doses may cause mild effects such as digestive discomfort.
Can vitamin B12 interact with medications?
B12 can interact with certain medications, including metformin (commonly used for diabetes) and proton pump inhibitors (acid-reducing drugs). If you take any regular medication, consult your healthcare provider before starting supplementation.
Is vitamin B12 safe during pregnancy?
Yes, adequate B12 is important for healthy fetal development. Pregnant and breastfeeding women should ensure sufficient intake, and supplementation may be particularly relevant for those following plant-based diets. Always consult your healthcare provider for guidance on appropriate dosage during pregnancy.
Research
B12 & cognition review — ScienceDirect (2025). [Narrative review]. https://www.sciencedirect.com/science/article/pii/S266645932500040X
Cureus - Neurological Sequelae SR (2025). [Systematic Review]. https://pmc.ncbi.nlm.nih.gov/articles/PMC12143585/
Habtie TE et al. – Oxidative medicine and cellular longevity (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/40458194/
Ulloque-Badaracco JR et al. – Frontiers in public health (2025). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/39991695/
Castillo LF et al. – Annual review of nutrition (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/40315282/
Janko RK et al. – American journal of health promotion : AJHP (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/39136672/
Verduci E et al. – Journal of pediatric gastroenterology and nutrition (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/40819279/
Deng XL et al. – Frontiers in endocrinology (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/40612436/
Niklewicz et al. — meta-analysis (2024). [SR + meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/39373282/
Vegan B12 scoping review (2024). [Scoping review]. https://pmc.ncbi.nlm.nih.gov/articles/PMC11124153/
Sandoval Leiva T et al. – Nutricion hospitalaria (2024). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/38896115/
Abdelwahab OA et al. – Irish journal of medical science (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/38231320/
Desmond MA et al. – Nutrients (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/38474851/
Zhang N et al. – Clinical nutrition (Edinburgh, Scotland) (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/38824900/
Bekdash RA – International journal of molecular sciences (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/38612845/
German cross-sectional — Annals of Medicine (2023). [Cross-sectional]. https://www.tandfonline.com/doi/full/10.1080/07853890.2023.2269969
Alruwaili M et al. - Healthcare (2023). [Systematic Review & Meta-Analysis]. https://pubmed.ncbi.nlm.nih.gov/37046885/
Jensen CF – Nutrition reviews (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/36413044/
Neufingerl N et al. – Nutrients (2023). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/37892416/
Manapurath R et al. – The Journal of nutrition (2023). [RCT]. https://pubmed.ncbi.nlm.nih.gov/36889645/
Fardous AM et al. – Nutrients (2023). [Review]. https://pubmed.ncbi.nlm.nih.gov/37960352/
Heilfort L et al. – Nutrition and cancer (2023). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/35819060/
Modica JS et al. – Journal of the neurological sciences (2023). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/37210937/
Clements M et al. – Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research (2022). [RCT]. https://pubmed.ncbi.nlm.nih.gov/36128889/
McMullin PR et al. – Current pain and headache reports (2022). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/35794449/
Rogers et al. — meta-analysis (2021). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/33809274/
Nalder et al. — Nutrients (2021). [Systematic review & MA]. https://pubmed.ncbi.nlm.nih.gov/34371786/
Rashid S et al. – European journal of haematology (2021). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/33341967/
Anamnart C et al. – Journal of clinical neuroscience : official journal of the Neurosurgical Society of Australasia (2021). [RCT]. https://pubmed.ncbi.nlm.nih.gov/33992189/
Neufingerl N et al. – Nutrients (2021). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/35010904/
Karcz K et al. – Critical reviews in food science and nutrition (2021). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/32319307/
Stein J et al. – European journal of neurology (2021). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/33619867/
Sawangjit R et al. – Journal of alternative and complementary medicine (New York, N.Y.) (2020). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/32716261/
Li X et al. – International journal of medical sciences (2020). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/32218697/
Julian T et al. – Nutrients (2020). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/32722436/
Obeid et al. — Clin Chem Lab Med (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/31188752/
Ma F et al. – Current Alzheimer research (2019). [RCT]. https://pubmed.ncbi.nlm.nih.gov/31345146/
Naik S et al. – Nutrients (2019). [RCT]. https://pubmed.ncbi.nlm.nih.gov/31590426/
Sanderson SM et al. – Nature reviews. Cancer (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/31515518/
Yang W et al. – Journal of diabetes (2019). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/30615306/
Obeid R et al. — Nutrients (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/30791639/
Molloy AM - Annals of NY Academy of Sciences (2018). [Review]. https://pubmed.ncbi.nlm.nih.gov/29377209/
Langan & Goodbred — Am Fam Physician (2017). [Clinical review]. https://pubmed.ncbi.nlm.nih.gov/28925645/
Green R et al. - Nature Reviews Disease Primers (2017). [Comprehensive Review]. https://pubmed.ncbi.nlm.nih.gov/28660890/
Zhang DM et al. – Journal of geriatric psychiatry and neurology (2017). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/28248558/
Green R et al. — Nat Rev Dis Primers (2017). [Seminal review]. https://pubmed.ncbi.nlm.nih.gov/28660890/
Langan RC & Goodbred AJ — Am Fam Physician (2017). [Clinical review]. https://pubmed.ncbi.nlm.nih.gov/28925645/
Coppedè F – Archives of toxicology (2016). [Review]. https://pubmed.ncbi.nlm.nih.gov/27600794/
Rizzo G et al. — Nutrients (2016). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/27886044/
Dangour AD et al. - American Journal of Clinical Nutrition (OPEN Trial) (2015). [RCT]. https://pubmed.ncbi.nlm.nih.gov/26135351/
Pawlak et al. — Eur J Clin Nutr (2014). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/24667752/
Scaglione F et al. – Xenobiotica; the fate of foreign compounds in biological systems (2014). [Review]. https://pubmed.ncbi.nlm.nih.gov/24494987/
Stabler SP - New England Journal of Medicine (2013). [Clinical Review]. https://pubmed.ncbi.nlm.nih.gov/23301732/
Pietrzik K et al. – Clinical pharmacokinetics (2010). [Review]. https://pubmed.ncbi.nlm.nih.gov/20608755/
Tucker KL et al. - American Journal of Clinical Nutrition (Framingham) (2000). [Cohort Study]. https://pubmed.ncbi.nlm.nih.gov/10648266/
Lewis DP et al. – The Annals of pharmacotherapy (1995). [Review]. https://pubmed.ncbi.nlm.nih.gov/8520091/
B12 absorption mechanism — established (Established). [Established science].
57 studies — Vitamin B12
B12 & cognition review — ScienceDirect (2025). [Narrative review]. https://www.sciencedirect.com/science/article/pii/S266645932500040X
Cureus - Neurological Sequelae SR (2025). [Systematic Review]. https://pmc.ncbi.nlm.nih.gov/articles/PMC12143585/
Habtie TE et al. – Oxidative medicine and cellular longevity (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/40458194/
Ulloque-Badaracco JR et al. – Frontiers in public health (2025). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/39991695/
Castillo LF et al. – Annual review of nutrition (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/40315282/
Janko RK et al. – American journal of health promotion : AJHP (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/39136672/
Verduci E et al. – Journal of pediatric gastroenterology and nutrition (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/40819279/
Deng XL et al. – Frontiers in endocrinology (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/40612436/
Niklewicz et al. — meta-analysis (2024). [SR + meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/39373282/
Vegan B12 scoping review (2024). [Scoping review]. https://pmc.ncbi.nlm.nih.gov/articles/PMC11124153/
Sandoval Leiva T et al. – Nutricion hospitalaria (2024). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/38896115/
Abdelwahab OA et al. – Irish journal of medical science (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/38231320/
Desmond MA et al. – Nutrients (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/38474851/
Zhang N et al. – Clinical nutrition (Edinburgh, Scotland) (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/38824900/
Bekdash RA – International journal of molecular sciences (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/38612845/
German cross-sectional — Annals of Medicine (2023). [Cross-sectional]. https://www.tandfonline.com/doi/full/10.1080/07853890.2023.2269969
Alruwaili M et al. - Healthcare (2023). [Systematic Review & Meta-Analysis]. https://pubmed.ncbi.nlm.nih.gov/37046885/
Jensen CF – Nutrition reviews (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/36413044/
Neufingerl N et al. – Nutrients (2023). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/37892416/
Manapurath R et al. – The Journal of nutrition (2023). [RCT]. https://pubmed.ncbi.nlm.nih.gov/36889645/
Fardous AM et al. – Nutrients (2023). [Review]. https://pubmed.ncbi.nlm.nih.gov/37960352/
Heilfort L et al. – Nutrition and cancer (2023). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/35819060/
Modica JS et al. – Journal of the neurological sciences (2023). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/37210937/
Clements M et al. – Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research (2022). [RCT]. https://pubmed.ncbi.nlm.nih.gov/36128889/
McMullin PR et al. – Current pain and headache reports (2022). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/35794449/
Rogers et al. — meta-analysis (2021). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/33809274/
Nalder et al. — Nutrients (2021). [Systematic review & MA]. https://pubmed.ncbi.nlm.nih.gov/34371786/
Rashid S et al. – European journal of haematology (2021). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/33341967/
Anamnart C et al. – Journal of clinical neuroscience : official journal of the Neurosurgical Society of Australasia (2021). [RCT]. https://pubmed.ncbi.nlm.nih.gov/33992189/
Neufingerl N et al. – Nutrients (2021). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/35010904/
Karcz K et al. – Critical reviews in food science and nutrition (2021). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/32319307/
Stein J et al. – European journal of neurology (2021). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/33619867/
Sawangjit R et al. – Journal of alternative and complementary medicine (New York, N.Y.) (2020). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/32716261/
Li X et al. – International journal of medical sciences (2020). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/32218697/
Julian T et al. – Nutrients (2020). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/32722436/
Obeid et al. — Clin Chem Lab Med (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/31188752/
Ma F et al. – Current Alzheimer research (2019). [RCT]. https://pubmed.ncbi.nlm.nih.gov/31345146/
Naik S et al. – Nutrients (2019). [RCT]. https://pubmed.ncbi.nlm.nih.gov/31590426/
Sanderson SM et al. – Nature reviews. Cancer (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/31515518/
Yang W et al. – Journal of diabetes (2019). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/30615306/
Obeid R et al. — Nutrients (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/30791639/
Molloy AM - Annals of NY Academy of Sciences (2018). [Review]. https://pubmed.ncbi.nlm.nih.gov/29377209/
Langan & Goodbred — Am Fam Physician (2017). [Clinical review]. https://pubmed.ncbi.nlm.nih.gov/28925645/
Green R et al. - Nature Reviews Disease Primers (2017). [Comprehensive Review]. https://pubmed.ncbi.nlm.nih.gov/28660890/
Zhang DM et al. – Journal of geriatric psychiatry and neurology (2017). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/28248558/
Green R et al. — Nat Rev Dis Primers (2017). [Seminal review]. https://pubmed.ncbi.nlm.nih.gov/28660890/
Langan RC & Goodbred AJ — Am Fam Physician (2017). [Clinical review]. https://pubmed.ncbi.nlm.nih.gov/28925645/
Coppedè F – Archives of toxicology (2016). [Review]. https://pubmed.ncbi.nlm.nih.gov/27600794/
Rizzo G et al. — Nutrients (2016). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/27886044/
Dangour AD et al. - American Journal of Clinical Nutrition (OPEN Trial) (2015). [RCT]. https://pubmed.ncbi.nlm.nih.gov/26135351/
Pawlak et al. — Eur J Clin Nutr (2014). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/24667752/
Scaglione F et al. – Xenobiotica; the fate of foreign compounds in biological systems (2014). [Review]. https://pubmed.ncbi.nlm.nih.gov/24494987/
Stabler SP - New England Journal of Medicine (2013). [Clinical Review]. https://pubmed.ncbi.nlm.nih.gov/23301732/
Pietrzik K et al. – Clinical pharmacokinetics (2010). [Review]. https://pubmed.ncbi.nlm.nih.gov/20608755/
Tucker KL et al. - American Journal of Clinical Nutrition (Framingham) (2000). [Cohort Study]. https://pubmed.ncbi.nlm.nih.gov/10648266/
Lewis DP et al. – The Annals of pharmacotherapy (1995). [Review]. https://pubmed.ncbi.nlm.nih.gov/8520091/
B12 absorption mechanism — established (Established). [Established science].
The Benefits of Biotin
Bioactive Form
Biotin (Vitamin B7) is a water-soluble B vitamin that supports the maintenance of normal hair, skin, and mucous membranes. It plays an important role in macronutrient metabolism, helping the body convert fats, carbohydrates, and proteins into energy. While biotin deficiency is relatively rare in the general population, certain groups may benefit from supplementation.
Key Highlights
- Contributes to the maintenance of normal hair (EFSA approved)
- Supports the maintenance of normal skin (EFSA approved)
- Contributes to the maintenance of normal mucous membranes (EFSA approved)
- Supports normal energy-yielding metabolism (EFSA approved)
- Contributes to normal macronutrient metabolism (EFSA approved)
- Contributes to normal functioning of the nervous system (EFSA approved)
- Most beneficial for those with deficiency or at-risk groups
Biochemistry Timeline
Biotin is water-soluble, meaning the body does not store it in large amounts and regular intake is needed. Improvements in nail strength may take 3 to 6 months of consistent supplementation (research on brittle nails used 2,500-3,000 µg/day for several months; Patel et al., 2017).
For hair-related concerns, visible improvements also require patience, as the hair growth cycle means new growth takes several months to become noticeable. If biotin deficiency is confirmed, improvements in skin and energy may be noticed more quickly, within 4 to 8 weeks.
Nail Health
Biotin supplementation has shown the most consistent evidence for brittle nail syndrome. Case reports and small studies have demonstrated improvement in nail thickness and reduced splitting at doses of 2,500-3,000 µg/day (Patel et al., 2017).
While the evidence base is limited to smaller studies, the results have been consistently positive for those with brittle or splitting nails. Biotin supports keratin infrastructure, the structural protein that forms the foundation of both nails and hair.
Nervous System Function
Biotin contributes to the normal functioning of the nervous system, an EFSA-approved health claim. It is involved in the synthesis of myelin, the protective sheath around nerve fibres, and in neurotransmitter activity.
Biotin deficiency has been associated with neurological symptoms including depression, lethargy, and numbness in the extremities (Valizadeh & Valizadeh, 2011, documented neuropsychiatric symptoms as an early manifestation of B12 deficiency, with similar mechanisms relevant to biotin). Ensuring adequate biotin intake supports normal nervous system function as part of overall B vitamin sufficiency.
Summary
Biotin (Vitamin B7) supports the maintenance of normal hair, skin, mucous membranes, and nervous system function. It plays a key role in macronutrient metabolism, helping the body convert food into energy. While biotin deficiency is relatively rare, it is more common among pregnant women, those taking certain medications, and women experiencing hair loss.
We believe in being honest about the evidence: biotin supplementation is most beneficial for those with a deficiency or specific conditions like brittle nails. For those with adequate levels, other nutrients may be more impactful for hair and skin health. As part of a comprehensive supplement plan, biotin supports the body's metabolic and structural needs.
FAQs
Will biotin make my hair grow faster?
If you have a biotin deficiency, supplementation may improve hair health. However, research does not support biotin for hair growth in those with adequate levels. Hair concerns are often multifactorial, involving iron, zinc, vitamin D, and hormonal health. A comprehensive approach is more effective than relying on biotin alone.
How much biotin should I take?
The adequate intake for adults is 30-40 µg per day. Supplements commonly provide much higher doses (1,000-10,000 µg). For brittle nails, research has used 2,500-3,000 µg per day. There is no established upper limit, as toxicity is extremely rare.
Can biotin affect blood test results?
Yes, high-dose biotin supplementation can interfere with certain laboratory tests, including thyroid function tests and troponin (a heart marker). If you take high-dose biotin, inform your healthcare provider before any blood tests.
Are there any side effects?
Biotin is generally well-tolerated with no established upper limit. Side effects are extremely rare. Some people report mild skin breakouts when starting high-dose biotin, though this is not consistently documented in research.
Is biotin safe during pregnancy?
Yes, biotin is considered safe during pregnancy. In fact, biotin requirements may increase during pregnancy, and mild deficiency is relatively common in pregnant women. Consult your healthcare provider for appropriate dosage guidance.
Research
Gaffney PJ et al. – Multiple sclerosis and related disorders (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/41124782/
Chai Y et al. – Asia Pacific journal of clinical nutrition (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/39828265/
Zhu Y et al. – European journal of nutrition (2025). [RCT]. https://pubmed.ncbi.nlm.nih.gov/41117955/
Cao AA et al. – Neuro-ophthalmology (Aeolus Press) (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/40190376/
Zaraa I et al. – Skin appendage disorders (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/40176998/
Yelich et al. — PRISMA review (2024). [Systematic review (PRISMA)]. https://pmc.ncbi.nlm.nih.gov/articles/PMC11324195/
Ma G et al. – Microbiology spectrum (2024). [RCT]. https://pubmed.ncbi.nlm.nih.gov/38687069/
Gan Y et al. – Acta epileptologica (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/40217438/
Karachaliou CE et al. – International journal of molecular sciences (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/38928282/
Lagzi N et al. – International journal of psychiatry in medicine (2023). [RCT]. https://pubmed.ncbi.nlm.nih.gov/37256965/
Berger MM et al. – Clinical nutrition (Edinburgh, Scotland) (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/35365361/
Dasgupta A – Advances in clinical chemistry (2022). [Review]. https://pubmed.ncbi.nlm.nih.gov/35953126/
Zhang Y et al. – Frontiers in nutrition (2022). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/36386951/
Espiritu AI et al. – Multiple sclerosis and related disorders (2021). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/34332461/
Chessa MA et al. – Dermatology and therapy (2020). [Review]. https://pubmed.ncbi.nlm.nih.gov/31749091/
Cree BAC et al. – The Lancet. Neurology (2020). [RCT]. https://pubmed.ncbi.nlm.nih.gov/33222767/
Almohanna et al. — Dermatol Ther (2019). [Comprehensive review].
Piraccini BM et al. – Giornale italiano di dermatologia e venereologia : organo ufficiale, Societa italiana di dermatologia e sifilografia (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/31638351/
Chiavetta A et al. – Dermatologic therapy (2019). [RCT]. https://pubmed.ncbi.nlm.nih.gov/31344296/
Lipner — Cutis (2018). [Review]. https://pubmed.ncbi.nlm.nih.gov/30372723/
Lipner SR et al. – The Journal of dermatological treatment (2018). [Review]. https://pubmed.ncbi.nlm.nih.gov/29057689/
Tourbah A et al. – CNS drugs (2018). [RCT]. https://pubmed.ncbi.nlm.nih.gov/29808469/
Lipner SR — J Am Acad Dermatol (2018). [Review]. https://pubmed.ncbi.nlm.nih.gov/29709619/
Patel et al. — Skin Appendage Disord (2017). [Systematic review]. https://pmc.ncbi.nlm.nih.gov/articles/PMC5582478/
Patel et al. — Skin Appendage Disord (2017). [Systematic review (18 cases)].
Patel et al. — Skin Appendage Disord (2017). [Systematic review (18 cases)]. https://pubmed.ncbi.nlm.nih.gov/28879195/
Li et al. — FDA Safety Communication (2017). [Regulatory]. General
Patel DP et al. - Skin Appendage Disorders (2017). [Systematic Review]. https://pubmed.ncbi.nlm.nih.gov/28879195/
Li D et al. - FDA Safety Communication (2017). [Safety Alert]. Safety
Mock DM - Journal of Nutrition (2017). [Expert Review]. https://pubmed.ncbi.nlm.nih.gov/28053236/
Patel DP et al. — Skin Appendage Disord (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/28879195/
Mock DM — J Nutr (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/28490668/
Biotin lab interference — FDA warning (2017). [Safety notice]. https://www.fda.gov/safety/medwatch-safety-alerts-human-medical-products/biotin-may-interfere-lab-tests-fda-safety-communication
Elston MS et al. – The Journal of clinical endocrinology and metabolism (2016). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/27362288/
Tourbah A et al. – Multiple sclerosis (Houndmills, Basingstoke, England) (2016). [RCT]. https://pubmed.ncbi.nlm.nih.gov/27589059/
Sedel F et al. — Mult Scler Relat Disord (2016). [Review]. https://pubmed.ncbi.nlm.nih.gov/27063613/
Sedel et al. — Mult Scler Relat Disord (2015). [Pilot study]. https://pubmed.ncbi.nlm.nih.gov/25432947/
Sedel F et al. - Multiple Sclerosis and Related Disorders (2015). [Phase III RCT]. https://pubmed.ncbi.nlm.nih.gov/26590117/
EFSA NDA Panel — EFSA Journal (2014). [Regulatory / Scientific Opinion]. Regulatory / Foundational
Lapik IA et al. – Voprosy pitaniia (2014). [RCT]. https://pubmed.ncbi.nlm.nih.gov/25300112/
Li J & Wieringa FT — Asia Pac J Clin Nutr (2011). [Review].
Colombo et al. — Nutrients (2010). [Review]. General
Zempleni J et al. — Annu Rev Nutr (2009). [Review]. https://pubmed.ncbi.nlm.nih.gov/19400697/
Albarracin CA et al. – Diabetes/metabolism research and reviews (2008). [RCT]. https://pubmed.ncbi.nlm.nih.gov/17506119/
Scheinfeld N et al. – Journal of drugs in dermatology : JDD (2007). [Review]. https://pubmed.ncbi.nlm.nih.gov/17763607/
Albarracin C et al. – Journal of the cardiometabolic syndrome (2007). [RCT]. https://pubmed.ncbi.nlm.nih.gov/17684468/
Geohas J et al. – The American journal of the medical sciences (2007). [RCT]. https://pubmed.ncbi.nlm.nih.gov/17496732/
Bolander FF – Current opinion in investigational drugs (London, England : 2000) (2006). [Review]. https://pubmed.ncbi.nlm.nih.gov/17086936/
Singer GM et al. – Diabetes technology & therapeutics (2006). [RCT]. https://pubmed.ncbi.nlm.nih.gov/17109595/
Revilla-Monsalve C et al. – Biomedicine & pharmacotherapy = Biomedecine & pharmacotherapie (2006). [RCT]. https://pubmed.ncbi.nlm.nih.gov/16677798/
Scher RK et al. – Dermatology nursing (2003). [Review]. https://pubmed.ncbi.nlm.nih.gov/12656000/
Biotin keratin mechanism — established (Established). [Established science].
Biotin pregnancy needs — established (Established). [Clinical observation].
53 studies — Biotin
Gaffney PJ et al. – Multiple sclerosis and related disorders (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/41124782/
Chai Y et al. – Asia Pacific journal of clinical nutrition (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/39828265/
Zhu Y et al. – European journal of nutrition (2025). [RCT]. https://pubmed.ncbi.nlm.nih.gov/41117955/
Cao AA et al. – Neuro-ophthalmology (Aeolus Press) (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/40190376/
Zaraa I et al. – Skin appendage disorders (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/40176998/
Yelich et al. — PRISMA review (2024). [Systematic review (PRISMA)]. https://pmc.ncbi.nlm.nih.gov/articles/PMC11324195/
Ma G et al. – Microbiology spectrum (2024). [RCT]. https://pubmed.ncbi.nlm.nih.gov/38687069/
Gan Y et al. – Acta epileptologica (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/40217438/
Karachaliou CE et al. – International journal of molecular sciences (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/38928282/
Lagzi N et al. – International journal of psychiatry in medicine (2023). [RCT]. https://pubmed.ncbi.nlm.nih.gov/37256965/
Berger MM et al. – Clinical nutrition (Edinburgh, Scotland) (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/35365361/
Dasgupta A – Advances in clinical chemistry (2022). [Review]. https://pubmed.ncbi.nlm.nih.gov/35953126/
Zhang Y et al. – Frontiers in nutrition (2022). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/36386951/
Espiritu AI et al. – Multiple sclerosis and related disorders (2021). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/34332461/
Chessa MA et al. – Dermatology and therapy (2020). [Review]. https://pubmed.ncbi.nlm.nih.gov/31749091/
Cree BAC et al. – The Lancet. Neurology (2020). [RCT]. https://pubmed.ncbi.nlm.nih.gov/33222767/
Almohanna et al. — Dermatol Ther (2019). [Comprehensive review].
Piraccini BM et al. – Giornale italiano di dermatologia e venereologia : organo ufficiale, Societa italiana di dermatologia e sifilografia (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/31638351/
Chiavetta A et al. – Dermatologic therapy (2019). [RCT]. https://pubmed.ncbi.nlm.nih.gov/31344296/
Lipner — Cutis (2018). [Review]. https://pubmed.ncbi.nlm.nih.gov/30372723/
Lipner SR et al. – The Journal of dermatological treatment (2018). [Review]. https://pubmed.ncbi.nlm.nih.gov/29057689/
Tourbah A et al. – CNS drugs (2018). [RCT]. https://pubmed.ncbi.nlm.nih.gov/29808469/
Lipner SR — J Am Acad Dermatol (2018). [Review]. https://pubmed.ncbi.nlm.nih.gov/29709619/
Patel et al. — Skin Appendage Disord (2017). [Systematic review]. https://pmc.ncbi.nlm.nih.gov/articles/PMC5582478/
Patel et al. — Skin Appendage Disord (2017). [Systematic review (18 cases)].
Patel et al. — Skin Appendage Disord (2017). [Systematic review (18 cases)]. https://pubmed.ncbi.nlm.nih.gov/28879195/
Li et al. — FDA Safety Communication (2017). [Regulatory]. General
Patel DP et al. - Skin Appendage Disorders (2017). [Systematic Review]. https://pubmed.ncbi.nlm.nih.gov/28879195/
Li D et al. - FDA Safety Communication (2017). [Safety Alert]. Safety
Mock DM - Journal of Nutrition (2017). [Expert Review]. https://pubmed.ncbi.nlm.nih.gov/28053236/
Patel DP et al. — Skin Appendage Disord (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/28879195/
Mock DM — J Nutr (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/28490668/
Biotin lab interference — FDA warning (2017). [Safety notice]. https://www.fda.gov/safety/medwatch-safety-alerts-human-medical-products/biotin-may-interfere-lab-tests-fda-safety-communication
Elston MS et al. – The Journal of clinical endocrinology and metabolism (2016). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/27362288/
Tourbah A et al. – Multiple sclerosis (Houndmills, Basingstoke, England) (2016). [RCT]. https://pubmed.ncbi.nlm.nih.gov/27589059/
Sedel F et al. — Mult Scler Relat Disord (2016). [Review]. https://pubmed.ncbi.nlm.nih.gov/27063613/
Sedel et al. — Mult Scler Relat Disord (2015). [Pilot study]. https://pubmed.ncbi.nlm.nih.gov/25432947/
Sedel F et al. - Multiple Sclerosis and Related Disorders (2015). [Phase III RCT]. https://pubmed.ncbi.nlm.nih.gov/26590117/
EFSA NDA Panel — EFSA Journal (2014). [Regulatory / Scientific Opinion]. Regulatory / Foundational
Lapik IA et al. – Voprosy pitaniia (2014). [RCT]. https://pubmed.ncbi.nlm.nih.gov/25300112/
Li J & Wieringa FT — Asia Pac J Clin Nutr (2011). [Review].
Colombo et al. — Nutrients (2010). [Review]. General
Zempleni J et al. — Annu Rev Nutr (2009). [Review]. https://pubmed.ncbi.nlm.nih.gov/19400697/
Albarracin CA et al. – Diabetes/metabolism research and reviews (2008). [RCT]. https://pubmed.ncbi.nlm.nih.gov/17506119/
Scheinfeld N et al. – Journal of drugs in dermatology : JDD (2007). [Review]. https://pubmed.ncbi.nlm.nih.gov/17763607/
Albarracin C et al. – Journal of the cardiometabolic syndrome (2007). [RCT]. https://pubmed.ncbi.nlm.nih.gov/17684468/
Geohas J et al. – The American journal of the medical sciences (2007). [RCT]. https://pubmed.ncbi.nlm.nih.gov/17496732/
Bolander FF – Current opinion in investigational drugs (London, England : 2000) (2006). [Review]. https://pubmed.ncbi.nlm.nih.gov/17086936/
Singer GM et al. – Diabetes technology & therapeutics (2006). [RCT]. https://pubmed.ncbi.nlm.nih.gov/17109595/
Revilla-Monsalve C et al. – Biomedicine & pharmacotherapy = Biomedecine & pharmacotherapie (2006). [RCT]. https://pubmed.ncbi.nlm.nih.gov/16677798/
Scher RK et al. – Dermatology nursing (2003). [Review]. https://pubmed.ncbi.nlm.nih.gov/12656000/
Biotin keratin mechanism — established (Established). [Established science].
Biotin pregnancy needs — established (Established). [Clinical observation].
The Benefits of Vitamin B5
Bioavailable Form
Pantothenic Acid (Vitamin B5) is an essential water-soluble vitamin found in virtually all foods, which is reflected in its name (from the Greek "pantos" meaning "everywhere"). It is a component of coenzyme A (CoA), one of the most important molecules in metabolism, essential for energy production, hormone synthesis, and the manufacture of fatty acids.
Key Highlights
- Contributes to normal energy-yielding metabolism (EFSA approved)
- Supports normal mental performance (EFSA approved)
- Contributes to normal synthesis of steroid hormones, vitamin D, and neurotransmitters (EFSA approved)
- Supports the reduction of tiredness and fatigue (EFSA approved)
- Component of Coenzyme A, involved in 70+ metabolic pathways
- Found in virtually all foods ("pantos" = everywhere)
Biochemistry Timeline
Pantothenic acid is water-soluble and well-absorbed. Because it is so widely available in food, isolated deficiency is very rare. Blood levels respond quickly to supplementation. There is no established European upper limit due to its excellent safety profile.
Skin and Wound Healing
Pantothenic acid (and its derivative dexpanthenol/panthenol) has been widely used in skincare and wound healing products. It supports skin cell regeneration and the formation of new tissue. While this is primarily a topical application, internal supplementation supports the body's overall capacity for tissue repair.
Stress Adaptation
Because pantothenic acid is needed for the synthesis of cortisol and other stress hormones, it supports the body's ability to respond to and recover from stress. Adequate pantothenic acid ensures that the adrenal glands, which produce stress hormones, have the raw materials they need for optimal function.
Summary
Pantothenic Acid (Vitamin B5) is an essential component of Coenzyme A, supporting energy production, hormone synthesis, mental performance, and fatigue reduction. It is found in virtually all foods and is well-tolerated with no established upper limit. EFSA recognises its contributions to energy metabolism, mental performance, steroid hormone synthesis, and tiredness reduction.
FAQs
How much pantothenic acid do I need?
The adequate intake for adults is 5 mg per day. There is no established upper limit. Supplements commonly provide 5-10 mg per day within B-complex formulations.
Is pantothenic acid the same as panthenol in skincare?
Panthenol (dexpanthenol) is a derivative of pantothenic acid used topically in skincare. When applied to skin, it converts to pantothenic acid and supports skin hydration and repair.
Is it safe during pregnancy?
Yes, pantothenic acid is considered safe during pregnancy. Adequate intake supports both maternal and fetal health.
Research
Goluch Z, Haraf G, Okruszek A et al. (2026). Impact of various types of heat treatment on the content of selected B vitamin and their profile in goose breast meat. Poult Sci. https://pubmed.ncbi.nlm.nih.gov/41850071/
Kumari G, Pal AC, Singh P et al. (2026). Continuous In Vitro Propagation of the Human Pathogen Babesia microti in Human Erythrocytes. bioRxiv. https://pubmed.ncbi.nlm.nih.gov/41847018/
González-Mercado VJ, Jean Lim S, Kumar Singh P et al. (2026). Dietary Quality and Microbiome Profiles among Rectal Cancer Patients: A Cross-Sectional Pilot Study. P R Health Sci J. https://pubmed.ncbi.nlm.nih.gov/41842880/
Bartella L, Mazzotti F, Santoro I et al. (2026). HPLC-Orbitrap-MS for the Determination of B-Vitamins in Fruit Juices and Food Supplements. J Mass Spectrom. https://pubmed.ncbi.nlm.nih.gov/41833989/
Wang H, Zhao Y, Dang D et al. (2026). Structure-function relationship of Konjac glucomannan with varying acetylation degrees in modulating gut microbiota and alleviating prediabetes. Carbohydr Polym. https://pubmed.ncbi.nlm.nih.gov/41832011/
Liu X, Jin R, Domingo R et al. (2026). The Plasmodium falciparum PPCS is a unique heteromeric complex with prokaryote-like activity and is a target of pantothenate analogs. Sci Adv. https://pubmed.ncbi.nlm.nih.gov/41824577/
Liu S, Wang M, Wang W (2026). [Analysis of urine biomarkers in urothelial carcinoma based on untargeted metabolomics]. Se Pu. https://pubmed.ncbi.nlm.nih.gov/41814906/
Zhang Y, Zhou T, Luo Z et al. (2026). Comparative Study of B Vitamins in Multiple Tissues of Oilseed Crops and Leafty Vegetables Reveal Sesame as a Valuable Resource in Vitamin B(3), B(6) and B(12). Antioxidants (Basel). https://pubmed.ncbi.nlm.nih.gov/41750605/
Detopoulou P, Yannakoulia M, Fragopoulou E et al. (2026). Validation of the food compass score through 24 h recalls and measurement of erythrocyte fatty acids in a mediterranean population. Eur J Nutr. https://pubmed.ncbi.nlm.nih.gov/41739225/
López-Sánchez M, Mendoza-Mota H, De-la-Cruz-Martínez L et al. (2026). Optimization of Indole- and Pyrazole-fused Glycyrrhetinic Acid Derivatives as Potent PTP1B Inhibitors: In Silico, In Vitro, In Vivo, and Metabolomic Studies. ACS Bio Med Chem Au. https://pubmed.ncbi.nlm.nih.gov/41726330/
Ramírez JCL, Vega-Cárdenas M, Vargas-Morales JM et al. (2026). Dietary Profile, Soluble Receptor for Advanced Glycation End Products (sRAGE) and Interleukin-6 in Individuals With Obesity and Periodontitis. Oral Dis. https://pubmed.ncbi.nlm.nih.gov/41725044/
Kheirouri S, Alizadeh M (2026). Pantothenic Acid and Parkinson Disease: A Systematic Review of Metabolomics Analysis Studies. Nutr Rev. https://pubmed.ncbi.nlm.nih.gov/41712554/
Puyana Rodríguez JM, Mata NV, Juliá Palacios N et al. (2026). Pantothenic Acid and Folate in Transport and Golgi Organization 2 (TANGO2) Deficiency: A Sibling Experience. Pediatr Neurol. https://pubmed.ncbi.nlm.nih.gov/41707637/
Ghosh SK, Bandyopadhyay D, Panja S (2026). B vitamins in dermatology. Clin Dermatol. https://pubmed.ncbi.nlm.nih.gov/41692080/
Krishnan M, Rushing BR, Howard AG et al. (2026). Integration of metabolomic and genetic data reveals novel variants underpinning the human metabolome: the Coronary Artery Risk Development in Young Adults (CARDIA) study. medRxiv. https://pubmed.ncbi.nlm.nih.gov/41646814/
Guo YY, Xue KJ, Wang L et al. (2026). Alterations in Gut Microbiota and Metabolic Profiles in Relapsed or Refractory Lymphoma. Microbiologyopen. https://pubmed.ncbi.nlm.nih.gov/41626654/
Han Y, Ou Q, Su Z et al. (2026). Competing endogenous RNAs (ceRNAs) orchestrate a gene regulatory network in the Aedes aegypti midgut in response to blood feeding. Insect Sci. https://pubmed.ncbi.nlm.nih.gov/41614448/
Li XK, Zhang N, Li HP et al. (2026). Metabolic engineering of Yarrowia lipolytica targeting bottlenecks to boost D-Pantothenic acid biosynthesis. Bioresour Bioprocess. https://pubmed.ncbi.nlm.nih.gov/41588274/
Banaszak M, Kosewski G, Górna I et al. (2025). Evaluation of Serum Antioxidant Activity in Type 2 Diabetes and Prediabetes: Links with Nutritional and Anthropometric Factors-Preliminary Studies. Curr Issues Mol Biol. https://pubmed.ncbi.nlm.nih.gov/41614781/
Yu J, Ao Y, Chen H et al. (2025). Effects of Dietary Supplementation with Dihydromyricetin on Hindgut Microbiota and Metabolite Profiles in Dairy Cows. Microorganisms. https://pubmed.ncbi.nlm.nih.gov/41597540/
20 studies — Vitamin B5
Goluch Z, Haraf G, Okruszek A et al. (2026). Impact of various types of heat treatment on the content of selected B vitamin and their profile in goose breast meat. Poult Sci. https://pubmed.ncbi.nlm.nih.gov/41850071/
Kumari G, Pal AC, Singh P et al. (2026). Continuous In Vitro Propagation of the Human Pathogen Babesia microti in Human Erythrocytes. bioRxiv. https://pubmed.ncbi.nlm.nih.gov/41847018/
González-Mercado VJ, Jean Lim S, Kumar Singh P et al. (2026). Dietary Quality and Microbiome Profiles among Rectal Cancer Patients: A Cross-Sectional Pilot Study. P R Health Sci J. https://pubmed.ncbi.nlm.nih.gov/41842880/
Bartella L, Mazzotti F, Santoro I et al. (2026). HPLC-Orbitrap-MS for the Determination of B-Vitamins in Fruit Juices and Food Supplements. J Mass Spectrom. https://pubmed.ncbi.nlm.nih.gov/41833989/
Wang H, Zhao Y, Dang D et al. (2026). Structure-function relationship of Konjac glucomannan with varying acetylation degrees in modulating gut microbiota and alleviating prediabetes. Carbohydr Polym. https://pubmed.ncbi.nlm.nih.gov/41832011/
Liu X, Jin R, Domingo R et al. (2026). The Plasmodium falciparum PPCS is a unique heteromeric complex with prokaryote-like activity and is a target of pantothenate analogs. Sci Adv. https://pubmed.ncbi.nlm.nih.gov/41824577/
Liu S, Wang M, Wang W (2026). [Analysis of urine biomarkers in urothelial carcinoma based on untargeted metabolomics]. Se Pu. https://pubmed.ncbi.nlm.nih.gov/41814906/
Zhang Y, Zhou T, Luo Z et al. (2026). Comparative Study of B Vitamins in Multiple Tissues of Oilseed Crops and Leafty Vegetables Reveal Sesame as a Valuable Resource in Vitamin B(3), B(6) and B(12). Antioxidants (Basel). https://pubmed.ncbi.nlm.nih.gov/41750605/
Detopoulou P, Yannakoulia M, Fragopoulou E et al. (2026). Validation of the food compass score through 24 h recalls and measurement of erythrocyte fatty acids in a mediterranean population. Eur J Nutr. https://pubmed.ncbi.nlm.nih.gov/41739225/
López-Sánchez M, Mendoza-Mota H, De-la-Cruz-Martínez L et al. (2026). Optimization of Indole- and Pyrazole-fused Glycyrrhetinic Acid Derivatives as Potent PTP1B Inhibitors: In Silico, In Vitro, In Vivo, and Metabolomic Studies. ACS Bio Med Chem Au. https://pubmed.ncbi.nlm.nih.gov/41726330/
Ramírez JCL, Vega-Cárdenas M, Vargas-Morales JM et al. (2026). Dietary Profile, Soluble Receptor for Advanced Glycation End Products (sRAGE) and Interleukin-6 in Individuals With Obesity and Periodontitis. Oral Dis. https://pubmed.ncbi.nlm.nih.gov/41725044/
Kheirouri S, Alizadeh M (2026). Pantothenic Acid and Parkinson Disease: A Systematic Review of Metabolomics Analysis Studies. Nutr Rev. https://pubmed.ncbi.nlm.nih.gov/41712554/
Puyana Rodríguez JM, Mata NV, Juliá Palacios N et al. (2026). Pantothenic Acid and Folate in Transport and Golgi Organization 2 (TANGO2) Deficiency: A Sibling Experience. Pediatr Neurol. https://pubmed.ncbi.nlm.nih.gov/41707637/
Ghosh SK, Bandyopadhyay D, Panja S (2026). B vitamins in dermatology. Clin Dermatol. https://pubmed.ncbi.nlm.nih.gov/41692080/
Krishnan M, Rushing BR, Howard AG et al. (2026). Integration of metabolomic and genetic data reveals novel variants underpinning the human metabolome: the Coronary Artery Risk Development in Young Adults (CARDIA) study. medRxiv. https://pubmed.ncbi.nlm.nih.gov/41646814/
Guo YY, Xue KJ, Wang L et al. (2026). Alterations in Gut Microbiota and Metabolic Profiles in Relapsed or Refractory Lymphoma. Microbiologyopen. https://pubmed.ncbi.nlm.nih.gov/41626654/
Han Y, Ou Q, Su Z et al. (2026). Competing endogenous RNAs (ceRNAs) orchestrate a gene regulatory network in the Aedes aegypti midgut in response to blood feeding. Insect Sci. https://pubmed.ncbi.nlm.nih.gov/41614448/
Li XK, Zhang N, Li HP et al. (2026). Metabolic engineering of Yarrowia lipolytica targeting bottlenecks to boost D-Pantothenic acid biosynthesis. Bioresour Bioprocess. https://pubmed.ncbi.nlm.nih.gov/41588274/
Banaszak M, Kosewski G, Górna I et al. (2025). Evaluation of Serum Antioxidant Activity in Type 2 Diabetes and Prediabetes: Links with Nutritional and Anthropometric Factors-Preliminary Studies. Curr Issues Mol Biol. https://pubmed.ncbi.nlm.nih.gov/41614781/
Yu J, Ao Y, Chen H et al. (2025). Effects of Dietary Supplementation with Dihydromyricetin on Hindgut Microbiota and Metabolite Profiles in Dairy Cows. Microorganisms. https://pubmed.ncbi.nlm.nih.gov/41597540/
The Benefits of Calcium
Dual-Form Blend
Calcium is the most abundant mineral in the body, with approximately 99% stored in bones and teeth. It is essential for bone structure, muscle function, nerve signalling, and blood clotting. Adequate calcium intake, particularly when combined with vitamin D and K2, supports lifelong bone health and helps reduce the risk of osteoporosis.
Key Highlights
- Contributes to the maintenance of normal bones (EFSA approved)
- Supports normal muscle function (EFSA approved)
- Contributes to the maintenance of normal teeth (EFSA approved)
- Supports normal blood clotting (EFSA approved)
- Contributes to normal neurotransmission (EFSA approved)
- Supports normal energy-yielding metabolism (EFSA approved)
- Best combined with vitamin D3 and K2 for bone health
Biochemistry Timeline
Calcium absorption depends on vitamin D status and varies by age and hormonal status. The body absorbs roughly 30-35% of dietary calcium. Benefits for bone density require consistent long-term intake, as bone remodelling is a gradual process. Short-term effects on muscle and nerve function occur immediately, as blood calcium levels are tightly regulated.
Blood Clotting
Calcium is essential for the blood clotting cascade. Without adequate calcium, blood would not clot properly. This is one of calcium's most critical functions, and the body prioritises maintaining blood calcium levels even at the expense of bone stores if dietary intake is insufficient. EFSA recognises that calcium contributes to normal blood clotting.
Nerve and Cell Signalling
Calcium ions serve as important signalling molecules throughout the body. They are involved in neurotransmitter release, hormone secretion, and cell-to-cell communication. EFSA recognises that calcium contributes to normal neurotransmission and has a role in the process of cell division and specialisation.
Summary
Calcium is the most abundant mineral in the body, essential for bone health, muscle function, blood clotting, and nerve signalling. Combined with vitamin D3 and K2, calcium supplementation supports bone density and reduces fracture risk. EFSA recognises its contributions to bones, teeth, muscle function, blood clotting, and neurotransmission. Adequate intake is particularly important for women approaching and after menopause.
FAQs
How much calcium do I need?
The recommended daily intake for adults is 800-1,000 mg. The European upper limit is 2,500 mg/day. Most people benefit from 500-1,000 mg/day from supplements if dietary intake is insufficient.
Should I take calcium with vitamin D?
Yes. Vitamin D significantly improves calcium absorption. Taking calcium alongside vitamin D3 and K2 provides optimal support for bone health. K2 helps direct calcium to bones rather than soft tissues.
Can calcium cause side effects?
High doses can cause constipation and bloating. Splitting doses (taking no more than 500 mg at a time) improves absorption and reduces digestive discomfort.
Is calcium safe during pregnancy?
Yes, calcium is important during pregnancy for maternal bone health and fetal skeletal development. Needs may increase during pregnancy and breastfeeding.
Research
Cong & Zhang — BMC Musculoskelet Disord (2025). [Meta-analysis (11 RCTs)]. https://pmc.ncbi.nlm.nih.gov/articles/PMC12506016/
Ma et al. — J Orthop Surg Res (2025). [Systematic review & MA (11 RCTs)]. https://pmc.ncbi.nlm.nih.gov/articles/PMC12506016/
Wei Y et al. – PeerJ (2025). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/40949733/
Skjøth JB et al. – International journal of circumpolar health (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/40388636/
Bai J et al. – Nutrients (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/41470812/
Raju S et al. – Nutrients (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/40362897/
Lee H et al. – Cancer causes & control : CCC (2025). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/40866745/
Wright D et al. – BJOG : an international journal of obstetrics and gynaecology (2024). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/38302677/
Zhang Y et al. – Journal of orthopaedic surgery and research (2024). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/39127644/
Inpan R et al. – Archives of osteoporosis (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/39708251/
Hou J et al. – Frontiers in public health (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/39328990/
Park HJ et al. – Osteoporosis international : a journal established as result of cooperation between the European Foundation for Osteoporosis and the National Osteoporosis Foundation of the USA (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/38472336/
Jaiswal V et al. – Current problems in cardiology (2024). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/38013011/
Zhu Q et al. – Pregnancy hypertension (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/39608269/
Cochrane Review — Ca+D in premenopausal women (2023). [Cochrane systematic review]. https://pmc.ncbi.nlm.nih.gov/articles/PMC9881395/
Méndez-Sánchez et al. — Cochrane Review (2023). [Cochrane systematic review (7 RCTs)]. https://pubmed.ncbi.nlm.nih.gov/36705288/
Mikola T et al. – Critical reviews in food science and nutrition (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/35816192/
Liu YH et al. – American journal of obstetrics and gynecology (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/36283479/
Al-Saleh Y et al. – Archives of osteoporosis (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/37213036/
Pappachan JM et al. – The Cochrane database of systematic reviews (2023). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/36883976/
Peeling P et al. – Sports medicine (Auckland, N.Z.) (2023). [Review]. https://pubmed.ncbi.nlm.nih.gov/37358750/
Chen WY et al. – Medicine (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/37653760/
Sun J et al. – Genome medicine (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/37726845/
Karavasiloglou N et al. – The American journal of clinical nutrition (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/36789942/
Thakur A et al. – Critical reviews in oncology/hematology (2023). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/37257732/
Liu et al. — eLife (2022). [Systematic review & MA]. https://pubmed.ncbi.nlm.nih.gov/36164828/
Gonçalves CR et al. – Reproductive biomedicine online (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/35461762/
Bristow SM et al. – European journal of clinical nutrition (2022). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/34131304/
Groenendijk I et al. – Bone (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/34666201/
Liabsuetrakul T et al. – Systematic reviews (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/35778751/
Woo Kinshella ML et al. – BJOG : an international journal of obstetrics and gynaecology (2022). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/35596262/
Cruz-Pierard SM et al. – Nutrients (2022). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/36432621/
Logan D et al. – Journal of dentistry (2021). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/34624418/
Jenkins DJA et al. – Journal of the American College of Cardiology (2021). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/33509399/
Barake M et al. – Osteoporosis international : a journal established as result of cooperation between the European Foundation for Osteoporosis and the National Osteoporosis Foundation of the USA (2021). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/33825915/
Chakhtoura M et al. – Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research (2021). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/34152628/
Shikh EV et al. – Voprosy pitaniia (2021). [Review]. https://pubmed.ncbi.nlm.nih.gov/34538035/
Liu et al. — Food & Function (2020). [Meta-analysis (RCTs)]. https://pubmed.ncbi.nlm.nih.gov/33237064/
Liu et al. — Arch Osteoporos (2020). [Systematic review & MA]. https://pubmed.ncbi.nlm.nih.gov/33237064/
Oh HJ et al. – Osteoporosis international : a journal established as result of cooperation between the European Foundation for Osteoporosis and the National Osteoporosis Foundation of the USA (2020). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/31776636/
Fogacci S et al. – Clinical nutrition (Edinburgh, Scotland) (2020). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/31526611/
Barrionuevo P et al. – The Journal of clinical endocrinology and metabolism (2019). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/30907957/
Boyne DJ et al. – JAMA network open (2019). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/31099875/
Kahwati et al. — JAMA (2018). [Evidence review (USPSTF)].
Cameron ID et al. – The Cochrane database of systematic reviews (2018). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/30191554/
Lambert MNT et al. – The American journal of clinical nutrition (2017). [RCT]. https://pubmed.ncbi.nlm.nih.gov/28768651/
Harvey NC et al. — Osteoporos Int (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/27975378/
Trautvetter U et al. – Nutrition journal (2016). [RCT]. https://pubmed.ncbi.nlm.nih.gov/26786148/
Schubert ML – Current opinion in gastroenterology (2016). [Review]. https://pubmed.ncbi.nlm.nih.gov/27607343/
Weaver CM et al. — Osteoporos Int (2016). [Review]. https://pubmed.ncbi.nlm.nih.gov/26510847/
Reid et al. — Osteoporos Int (2015). [Meta-analysis of RCTs]. https://pubmed.ncbi.nlm.nih.gov/26510847/
EFSA NDA Panel — EFSA Journal (2015). [Regulatory / Scientific Opinion]. Regulatory / Foundational
Tai V et al. - BMJ (2015). [Meta-Analysis]. https://pubmed.ncbi.nlm.nih.gov/26420387/
Reid IR et al. - Journal of Internal Medicine (2015). [Systematic Review]. https://pubmed.ncbi.nlm.nih.gov/25943556/
Reid IR et al. — BMJ (2015). [SR + meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/26174865/
Tai V et al. — BMJ (2015). [SR + meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/26420598/
Schubert ML – Current opinion in gastroenterology (2014). [Review]. https://pubmed.ncbi.nlm.nih.gov/25211241/
Chu S et al. – Current opinion in gastroenterology (2013). [Review]. https://pubmed.ncbi.nlm.nih.gov/24100729/
Bischoff-Ferrari et al. — NEJM (2012). [Review]. Sex/Life Stage
Bolland et al. — BMJ (2010). [Meta-analysis (11 RCTs)]. https://pubmed.ncbi.nlm.nih.gov/20671013/
Bolland MJ et al. - BMJ (2010). [Meta-Analysis]. https://pubmed.ncbi.nlm.nih.gov/20671013/
Lönnerdal B – International journal for vitamin and nutrition research. Internationale Zeitschrift fur Vitamin- und Ernahrungsforschung. Journal international de vitaminologie et de nutrition (2010). [Review]. https://pubmed.ncbi.nlm.nih.gov/21462112/
Filippatos TD et al. – Drug safety (2008). [Review]. https://pubmed.ncbi.nlm.nih.gov/18095746/
Bischoff-Ferrari HA et al. - JAMA (2005). [Meta-Analysis]. https://pubmed.ncbi.nlm.nih.gov/15886381/
Enemark JM et al. – Acta veterinaria Scandinavica. Supplementum (2003). [RCT]. https://pubmed.ncbi.nlm.nih.gov/14621401/
Abrams SA et al. – The Journal of nutrition (2003). [Review]. https://pubmed.ncbi.nlm.nih.gov/12949399/
Lutter CK et al. – The Journal of nutrition (2003). [Review]. https://pubmed.ncbi.nlm.nih.gov/12949402/
Meacham SL et al. – The American journal of clinical nutrition (1995). [RCT]. https://pubmed.ncbi.nlm.nih.gov/7840072/
Wise A – International journal of food sciences and nutrition (1995). [Review]. https://pubmed.ncbi.nlm.nih.gov/7712343/
Walker RC et al. – Mayo Clinic proceedings (1991). [Review]. https://pubmed.ncbi.nlm.nih.gov/1749294/
Calcium absorption factors — established (Established). [Established science].
71 studies — Calcium
Cong & Zhang — BMC Musculoskelet Disord (2025). [Meta-analysis (11 RCTs)]. https://pmc.ncbi.nlm.nih.gov/articles/PMC12506016/
Ma et al. — J Orthop Surg Res (2025). [Systematic review & MA (11 RCTs)]. https://pmc.ncbi.nlm.nih.gov/articles/PMC12506016/
Wei Y et al. – PeerJ (2025). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/40949733/
Skjøth JB et al. – International journal of circumpolar health (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/40388636/
Bai J et al. – Nutrients (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/41470812/
Raju S et al. – Nutrients (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/40362897/
Lee H et al. – Cancer causes & control : CCC (2025). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/40866745/
Wright D et al. – BJOG : an international journal of obstetrics and gynaecology (2024). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/38302677/
Zhang Y et al. – Journal of orthopaedic surgery and research (2024). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/39127644/
Inpan R et al. – Archives of osteoporosis (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/39708251/
Hou J et al. – Frontiers in public health (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/39328990/
Park HJ et al. – Osteoporosis international : a journal established as result of cooperation between the European Foundation for Osteoporosis and the National Osteoporosis Foundation of the USA (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/38472336/
Jaiswal V et al. – Current problems in cardiology (2024). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/38013011/
Zhu Q et al. – Pregnancy hypertension (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/39608269/
Cochrane Review — Ca+D in premenopausal women (2023). [Cochrane systematic review]. https://pmc.ncbi.nlm.nih.gov/articles/PMC9881395/
Méndez-Sánchez et al. — Cochrane Review (2023). [Cochrane systematic review (7 RCTs)]. https://pubmed.ncbi.nlm.nih.gov/36705288/
Mikola T et al. – Critical reviews in food science and nutrition (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/35816192/
Liu YH et al. – American journal of obstetrics and gynecology (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/36283479/
Al-Saleh Y et al. – Archives of osteoporosis (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/37213036/
Pappachan JM et al. – The Cochrane database of systematic reviews (2023). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/36883976/
Peeling P et al. – Sports medicine (Auckland, N.Z.) (2023). [Review]. https://pubmed.ncbi.nlm.nih.gov/37358750/
Chen WY et al. – Medicine (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/37653760/
Sun J et al. – Genome medicine (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/37726845/
Karavasiloglou N et al. – The American journal of clinical nutrition (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/36789942/
Thakur A et al. – Critical reviews in oncology/hematology (2023). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/37257732/
Liu et al. — eLife (2022). [Systematic review & MA]. https://pubmed.ncbi.nlm.nih.gov/36164828/
Gonçalves CR et al. – Reproductive biomedicine online (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/35461762/
Bristow SM et al. – European journal of clinical nutrition (2022). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/34131304/
Groenendijk I et al. – Bone (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/34666201/
Liabsuetrakul T et al. – Systematic reviews (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/35778751/
Woo Kinshella ML et al. – BJOG : an international journal of obstetrics and gynaecology (2022). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/35596262/
Cruz-Pierard SM et al. – Nutrients (2022). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/36432621/
Logan D et al. – Journal of dentistry (2021). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/34624418/
Jenkins DJA et al. – Journal of the American College of Cardiology (2021). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/33509399/
Barake M et al. – Osteoporosis international : a journal established as result of cooperation between the European Foundation for Osteoporosis and the National Osteoporosis Foundation of the USA (2021). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/33825915/
Chakhtoura M et al. – Journal of bone and mineral research : the official journal of the American Society for Bone and Mineral Research (2021). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/34152628/
Shikh EV et al. – Voprosy pitaniia (2021). [Review]. https://pubmed.ncbi.nlm.nih.gov/34538035/
Liu et al. — Food & Function (2020). [Meta-analysis (RCTs)]. https://pubmed.ncbi.nlm.nih.gov/33237064/
Liu et al. — Arch Osteoporos (2020). [Systematic review & MA]. https://pubmed.ncbi.nlm.nih.gov/33237064/
Oh HJ et al. – Osteoporosis international : a journal established as result of cooperation between the European Foundation for Osteoporosis and the National Osteoporosis Foundation of the USA (2020). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/31776636/
Fogacci S et al. – Clinical nutrition (Edinburgh, Scotland) (2020). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/31526611/
Barrionuevo P et al. – The Journal of clinical endocrinology and metabolism (2019). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/30907957/
Boyne DJ et al. – JAMA network open (2019). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/31099875/
Kahwati et al. — JAMA (2018). [Evidence review (USPSTF)].
Cameron ID et al. – The Cochrane database of systematic reviews (2018). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/30191554/
Lambert MNT et al. – The American journal of clinical nutrition (2017). [RCT]. https://pubmed.ncbi.nlm.nih.gov/28768651/
Harvey NC et al. — Osteoporos Int (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/27975378/
Trautvetter U et al. – Nutrition journal (2016). [RCT]. https://pubmed.ncbi.nlm.nih.gov/26786148/
Schubert ML – Current opinion in gastroenterology (2016). [Review]. https://pubmed.ncbi.nlm.nih.gov/27607343/
Weaver CM et al. — Osteoporos Int (2016). [Review]. https://pubmed.ncbi.nlm.nih.gov/26510847/
Reid et al. — Osteoporos Int (2015). [Meta-analysis of RCTs]. https://pubmed.ncbi.nlm.nih.gov/26510847/
EFSA NDA Panel — EFSA Journal (2015). [Regulatory / Scientific Opinion]. Regulatory / Foundational
Tai V et al. - BMJ (2015). [Meta-Analysis]. https://pubmed.ncbi.nlm.nih.gov/26420387/
Reid IR et al. - Journal of Internal Medicine (2015). [Systematic Review]. https://pubmed.ncbi.nlm.nih.gov/25943556/
Reid IR et al. — BMJ (2015). [SR + meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/26174865/
Tai V et al. — BMJ (2015). [SR + meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/26420598/
Schubert ML – Current opinion in gastroenterology (2014). [Review]. https://pubmed.ncbi.nlm.nih.gov/25211241/
Chu S et al. – Current opinion in gastroenterology (2013). [Review]. https://pubmed.ncbi.nlm.nih.gov/24100729/
Bischoff-Ferrari et al. — NEJM (2012). [Review]. Sex/Life Stage
Bolland et al. — BMJ (2010). [Meta-analysis (11 RCTs)]. https://pubmed.ncbi.nlm.nih.gov/20671013/
Bolland MJ et al. - BMJ (2010). [Meta-Analysis]. https://pubmed.ncbi.nlm.nih.gov/20671013/
Lönnerdal B – International journal for vitamin and nutrition research. Internationale Zeitschrift fur Vitamin- und Ernahrungsforschung. Journal international de vitaminologie et de nutrition (2010). [Review]. https://pubmed.ncbi.nlm.nih.gov/21462112/
Filippatos TD et al. – Drug safety (2008). [Review]. https://pubmed.ncbi.nlm.nih.gov/18095746/
Bischoff-Ferrari HA et al. - JAMA (2005). [Meta-Analysis]. https://pubmed.ncbi.nlm.nih.gov/15886381/
Enemark JM et al. – Acta veterinaria Scandinavica. Supplementum (2003). [RCT]. https://pubmed.ncbi.nlm.nih.gov/14621401/
Abrams SA et al. – The Journal of nutrition (2003). [Review]. https://pubmed.ncbi.nlm.nih.gov/12949399/
Lutter CK et al. – The Journal of nutrition (2003). [Review]. https://pubmed.ncbi.nlm.nih.gov/12949402/
Meacham SL et al. – The American journal of clinical nutrition (1995). [RCT]. https://pubmed.ncbi.nlm.nih.gov/7840072/
Wise A – International journal of food sciences and nutrition (1995). [Review]. https://pubmed.ncbi.nlm.nih.gov/7712343/
Walker RC et al. – Mayo Clinic proceedings (1991). [Review]. https://pubmed.ncbi.nlm.nih.gov/1749294/
Calcium absorption factors — established (Established). [Established science].
The Benefits of Phosphorus
Dual-Mineral Form
We use Dicalcium Phosphate as a dual-action source of calcium and phosphorus, two minerals essential for building and maintaining strong bones and teeth.
Key Highlights
- Supports strong bones and teeth alongside calcium
- Plays a central role in energy production (ATP)
- Helps maintain normal cell membrane structure
- Contributes to acid-base balance in the body
Biochemistry Timeline
Phosphorus is absorbed primarily in the small intestine, with effects beginning within hours of intake. As the second most abundant mineral in your body, it works continuously alongside calcium to maintain bone density. Noticeable improvements in energy metabolism and bone health typically develop over several weeks of consistent, adequate intake.
Summary
Phosphorus is essential for bone formation, energy metabolism, and cell function. It works closely with calcium, and most people get enough through a varied diet. Supplementation is rarely needed but can be relevant in specific situations where dietary intake is limited.
FAQs
Who might benefit from phosphorus supplementation?
Most people get adequate phosphorus from their diet, as it is found in many foods. Supplementation may be considered for individuals with certain medical conditions that affect phosphorus absorption, but this should always be discussed with a healthcare provider.
Can you take too much phosphorus?
Yes, excessive phosphorus intake, particularly from processed foods, can disrupt the calcium-phosphorus balance. It is important to maintain a healthy ratio between the two minerals for optimal bone health.
What foods are rich in phosphorus?
Good dietary sources include dairy products, meat, fish, eggs, nuts, seeds, and whole grains. A balanced diet typically provides sufficient phosphorus.
Research
Max F, Tesař T, Gažová A et al. (2026). Impact of High Doses of Vitamin D on Specific Metabolic Parameters in Type 2 Diabetes Patients: A Prospective Biomedical Study. Int J Vitam Nutr Res. https://pubmed.ncbi.nlm.nih.gov/41873102/
Zhu J, Hu Z, Xu H et al. (2026). Stage-dependent effects of composite probiotics on gut mineral transport, Skeletal health, and egg quality in laying hens. Poult Sci. https://pubmed.ncbi.nlm.nih.gov/41833116/
Al-Talib SA, Jan Mohamed HJ, Mitra AK et al. (2026). Impact of an Oral Nutrition Supplement on the Nutritional Status of Stunted and At-Risk of Stunting Children: A Community-Based Intervention Trial. Nutrients. https://pubmed.ncbi.nlm.nih.gov/41829924/
Lepczyński A, Herosimczyk A, Ożgo M et al. (2026). Inulin and multispecies probiotic effects on blood, liver and kidney biochemistry and metabolic and stress-related gene expression in pigs. Sci Rep. https://pubmed.ncbi.nlm.nih.gov/41826623/
Hamid MMA, Tharwat M, Ebeid TA et al. (2026). Nutritional Disorders and Metabolic Adaptations in Dromedary Camels: Insights into Foregut Fermentation and Mineral Balance. Animals (Basel) [Review]. https://pubmed.ncbi.nlm.nih.gov/41751150/
Saber HS, Khalil HA, El-Kashef MMA et al. (2026). Synergistic impacts of garlic and curcumin on growth performance, carcass characteristics, immunity, antioxidant status, and gut histology of broiler chickens. Poult Sci. https://pubmed.ncbi.nlm.nih.gov/41723958/
Guo Y, Zheng T, Wang M et al. (2026). Effects of glucose oxidase combined with clostridium butyricum on broiler growth performance, nutrient digestibility, antioxidant function, intestinal barrier, and intestinal microbiota. Poult Sci. https://pubmed.ncbi.nlm.nih.gov/41713094/
Zhang F, Yang L, Wang Q et al. (2026). Calcium yak caseinate promotes calcium absorption to prevent osteoporosis in mice. J Dairy Sci. https://pubmed.ncbi.nlm.nih.gov/41698576/
Muzzammil M, Qadir A, Minhas MO et al. (2026). Vitamin D deficiency and musculoskeletal pain intensity in young women: Evidence from a cross-sectional study in Karachi. Int J Orthop Trauma Nurs. https://pubmed.ncbi.nlm.nih.gov/41698307/
Zhao L, Chen F, Zhang H et al. (2026). Dietary Fish Oil and a Flavor and Multi-Enzyme Complex Supplementation Improved the Reproductive Performance, Nutrient Metabolism and Health of Primiparous Lactating Sows and Piglets. Animals (Basel). https://pubmed.ncbi.nlm.nih.gov/41681362/
Gordon L, Zipursky R, Cheung CC et al. (2026). Vitamin D Intoxication in an Adolescent due to Over-Supplementation: A Case Report and Review of Literature. AACE Endocrinol Diabetes. https://pubmed.ncbi.nlm.nih.gov/41641290/
Alalwani YJ, Alatta MA, Almana KA et al. (2026). Interventions for metabolic bone disease of prematurity: A systematic review and meta-analysis. Metabol Open. https://pubmed.ncbi.nlm.nih.gov/41625559/
Zhang L, Chen M, Behan AA et al. (2026). Phytase as a functional feed additive for poultry: mechanistic insights into thermoregulation and productive performance. Int J Biometeorol [Review]. https://pubmed.ncbi.nlm.nih.gov/41603980/
Gang G, Gao R, Tong M et al. (2026). Effect of Water Extract of Artemisia annua L. on Growth Performance, Blood Biochemical Parameters and Intestinal-Related Indices in Mutton Sheep. Animals (Basel). https://pubmed.ncbi.nlm.nih.gov/41594527/
Candow DG, Pratt J, Fabiano N et al. (2026). Creatine Supplementation and the Brain: Have We Put the Cart Before the Horse?. J Diet Suppl [Review]. https://pubmed.ncbi.nlm.nih.gov/41556609/
Costa EP, Sarandy MM, Lozi AA et al. (2026). Cow's Milk Positively Impacts Bone Formation by Regulating the Osteocalcin Pathway Compared to Transgenic and Non-Transgenic Soy-Based Beverages in BALB/c Mice. Mol Nutr Food Res. https://pubmed.ncbi.nlm.nih.gov/41543320/
Mahdavi R, Piray AH, Ghazi S et al. (2026). Efficacy of Supplementary Guanidinoacetic Acid at Different Dietary Crude Protein Levels on the Productive Performance, Egg Quality, Intestinal Morphology, Antioxidative Status, and Serum Metabolites of Aged Laying Hens Exposed to High Ambient Temperatures. Vet Med Sci. https://pubmed.ncbi.nlm.nih.gov/41532277/
Gultekin O, Akpolat AO, Illeez OG et al. (2026). Is vitamin D a risk factor in the development of Scheuermann's kyphosis?. J Pediatr Orthop B. https://pubmed.ncbi.nlm.nih.gov/41531267/
Umar Faruk M, Cowieson AJ, Aureli R et al. (2026). Protease supplementation in diets with varying crude protein levels: effects on production performance and blood biochemistry of aged laying hens. Br Poult Sci. https://pubmed.ncbi.nlm.nih.gov/41503715/
Walia A, Selvarajan R, Ogola HJO et al. (2025). Genome-resolved analysis of traditional fermented biofertilizers as scalable solutions for soil restoration. Front Microbiol. https://pubmed.ncbi.nlm.nih.gov/41531535/
20 studies — Phosphorus
Max F, Tesař T, Gažová A et al. (2026). Impact of High Doses of Vitamin D on Specific Metabolic Parameters in Type 2 Diabetes Patients: A Prospective Biomedical Study. Int J Vitam Nutr Res. https://pubmed.ncbi.nlm.nih.gov/41873102/
Zhu J, Hu Z, Xu H et al. (2026). Stage-dependent effects of composite probiotics on gut mineral transport, Skeletal health, and egg quality in laying hens. Poult Sci. https://pubmed.ncbi.nlm.nih.gov/41833116/
Al-Talib SA, Jan Mohamed HJ, Mitra AK et al. (2026). Impact of an Oral Nutrition Supplement on the Nutritional Status of Stunted and At-Risk of Stunting Children: A Community-Based Intervention Trial. Nutrients. https://pubmed.ncbi.nlm.nih.gov/41829924/
Lepczyński A, Herosimczyk A, Ożgo M et al. (2026). Inulin and multispecies probiotic effects on blood, liver and kidney biochemistry and metabolic and stress-related gene expression in pigs. Sci Rep. https://pubmed.ncbi.nlm.nih.gov/41826623/
Hamid MMA, Tharwat M, Ebeid TA et al. (2026). Nutritional Disorders and Metabolic Adaptations in Dromedary Camels: Insights into Foregut Fermentation and Mineral Balance. Animals (Basel) [Review]. https://pubmed.ncbi.nlm.nih.gov/41751150/
Saber HS, Khalil HA, El-Kashef MMA et al. (2026). Synergistic impacts of garlic and curcumin on growth performance, carcass characteristics, immunity, antioxidant status, and gut histology of broiler chickens. Poult Sci. https://pubmed.ncbi.nlm.nih.gov/41723958/
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The Benefits of Iron
Bioavailable Form
Iron is an essential mineral that plays a central role in oxygen transport, energy production, and immune function. It is a key component of haemoglobin, the protein in red blood cells that carries oxygen from the lungs to every cell in the body. Iron deficiency is one of the most common nutritional deficiencies worldwide, particularly among women of reproductive age.
Key Highlights
- Contributes to normal formation of red blood cells and haemoglobin (EFSA approved)
- Supports normal oxygen transport in the body (EFSA approved)
- Contributes to normal energy-yielding metabolism (EFSA approved)
- Supports the reduction of tiredness and fatigue (EFSA approved)
- Contributes to normal function of the immune system (EFSA approved)
- Supports normal cognitive function (EFSA approved)
- Particularly important for women of reproductive age
Biochemistry Timeline
Iron supplementation typically takes 4 to 12 weeks to replenish depleted stores, depending on the severity of deficiency and the dose used. Improvements in fatigue and energy may be noticed within 2 to 4 weeks, while normalisation of ferritin levels (the body's iron storage marker) often takes 3 months or longer.
Iron is best absorbed on an empty stomach, but if this causes digestive discomfort, taking it with a small amount of food (ideally with vitamin C, which enhances absorption) is a practical alternative. Avoid taking iron alongside calcium, tea, or coffee, as these can reduce absorption.
Hair Health
Iron deficiency is one of the most well-established nutritional causes of hair loss. Hair follicles are among the fastest-dividing cells in the body and are sensitive to nutritional status.
Research by Nagendran & Sakkaravarthi (2024) confirmed that iron deficiency is the most established cause of nutritional hair loss, with a ferritin level below 30 µg/L identified as a key threshold. A broader review (Wang et al., 2024) highlighted iron, zinc, vitamin D, and B vitamins as the most critical nutrients for hair health.
Supplementation has been shown to improve hair outcomes when iron deficiency is present. If you are experiencing hair thinning or increased shedding, checking your iron and ferritin levels is a sensible first step.
Cognitive Function
Iron is essential for normal cognitive function. The brain requires a consistent supply of oxygen, delivered via iron-containing haemoglobin, to function at its best. Iron also plays a role in neurotransmitter synthesis, including dopamine, which is important for focus, motivation, and mental clarity.
Low iron status has been associated with impaired concentration, reduced memory performance, and slower processing speed. These cognitive effects can occur even before anaemia develops, underscoring the importance of maintaining adequate iron stores.
EFSA recognises that iron contributes to normal cognitive function. For women, students, and anyone experiencing brain fog or difficulty concentrating, iron status is worth investigating.
Summary
Iron is essential for oxygen transport, energy production, immune function, and cognitive health. Iron deficiency is one of the most common nutritional deficiencies worldwide, particularly among women of reproductive age, and can cause fatigue, poor concentration, and hair loss even before full anaemia develops.
Supplementation is effective for replenishing depleted stores, with benefits typically noticeable within 2 to 4 weeks and full repletion taking 3 months or more. Iron is best absorbed with vitamin C and away from calcium, tea, or coffee.
FAQs
How do I know if I need iron supplementation?
Common signs of low iron include persistent fatigue, weakness, pale skin, cold hands and feet, brittle nails, hair thinning, and difficulty concentrating. A simple blood test measuring ferritin (iron storage) and haemoglobin can confirm whether supplementation is appropriate.
What ferritin level indicates a need for supplementation?
While laboratories often set the "normal" range from 12 µg/L upwards, many clinicians consider levels below 30 µg/L as insufficient for optimal health, particularly for hair, energy, and exercise performance. Discuss your results with your healthcare provider.
Can iron supplementation cause side effects?
Some people experience digestive discomfort, constipation, or nausea with iron supplements. Taking iron with a small amount of food or choosing a gentle form (such as iron bisglycinate) can help minimise these effects. Starting with a lower dose and gradually increasing can also improve tolerance.
Can I take too much iron?
Yes, excessive iron intake can be harmful. Iron is one of the few minerals where the body has no active excretion mechanism, so it can accumulate. Supplementation should be guided by blood test results, and it is not recommended to take high-dose iron without medical supervision.
Is iron safe during pregnancy?
Iron supplementation is commonly recommended during pregnancy, as iron needs increase significantly to support the growing baby and increased blood volume. Without supplementation, 28-85% of pregnant women may become iron deficient by the third trimester (Milman, 2017). Always follow your healthcare provider's guidance on dosage.
Research
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The Benefits of Magnesium
Dual-Form Blend
Magnesium Citrate is magnesium bound to citric acid, one of the most commonly used and cost-effective forms of magnesium supplements. It has good bioavailability and is well-studied. Citrate form is particularly known for supporting digestive regularity alongside the broad benefits of magnesium.
Key Highlights
- Good bioavailability at an accessible price point
- Supports digestive regularity alongside magnesium benefits
- EFSA: contributes to normal energy metabolism, muscle function, nervous system function, bone health, tiredness reduction
- Well-studied and widely available form
- May cause loose stools at higher doses in sensitive individuals
Biochemistry Timeline
Magnesium citrate is quickly absorbed. Benefits for energy and muscle function begin within 1 to 2 weeks. Digestive effects are typically noticed within days. Full systemic benefits develop over 4 to 8 weeks.
Summary
Magnesium Citrate is a well-absorbed, affordable form of magnesium that supports energy, muscle, nerve, and bone health with the added benefit of supporting digestive regularity. It is one of the most widely used magnesium supplements worldwide.
FAQs
Why might I choose citrate over bisglycinate?
Choose citrate if you also want digestive regularity support or prefer a more affordable option. Choose bisglycinate if you have a sensitive stomach, want calming/sleep benefits, or prefer a form less likely to cause loose stools.
Research
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The Benefits of Zinc Citrate
Bioavailable Form
Zinc Citrate is a well-absorbed form of zinc bound to citric acid. It supports immune defence, skin health, hormonal balance, and hair and nail maintenance. Zinc citrate is a practical choice for general zinc supplementation, offering good bioavailability at an accessible price point.
Key Highlights
- Well-absorbed zinc form bound to citric acid
- Supports immune function, skin, hair, and nails (EFSA approved)
- Good bioavailability at an accessible price point
- See our main Zinc page for detailed research and EFSA claims
Biochemistry Timeline
Zinc citrate is well-absorbed and benefits can begin within 2-4 weeks for immune and skin health. See our main Zinc page for detailed biochemistry and timelines.
Summary
Zinc Citrate is a well-absorbed form of zinc supporting immune, skin, hair, and hormonal health. See our main Zinc page for comprehensive research, EFSA claims, and detailed information.
FAQs
How does zinc citrate compare to other zinc forms?
Zinc citrate offers good bioavailability and is generally well-tolerated. It tends to cause less digestive discomfort than zinc sulphate, making it a popular choice for supplementation.
Can zinc interfere with copper absorption?
Yes, high doses of zinc taken over extended periods can reduce copper absorption. If you take zinc supplements long-term, ensuring adequate copper intake is important.
When is the best time to take zinc?
Zinc is best taken with food to reduce the chance of stomach discomfort. Avoid taking it at the same time as high-fibre meals or calcium supplements, as these can reduce absorption.
Research
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Ayhan et al. — J Cosmet Dermatol (2024). [Cross-sectional]. https://pmc.ncbi.nlm.nih.gov/articles/PMC11626366/
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Zinc deficiency and immunity — established (Established). [Biochemical mechanism]. General
76 studies — Zinc Citrate
Amanzholkyzy A et al. – Georgian medical news (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/41687657/
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PMC11626374 — Zinc and androgenic pathways (2024). [Mechanistic review]. https://pmc.ncbi.nlm.nih.gov/articles/PMC11626374/
Ayhan et al. — J Cosmet Dermatol (2024). [Cross-sectional]. https://pmc.ncbi.nlm.nih.gov/articles/PMC11626366/
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Hsu TJ et al. – Nutrients (2024). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/39683510/
Kapper C et al. – Nutrients (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/39683462/
Cui Y et al. – COPD (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/38591165/
Langer G et al. – The Cochrane database of systematic reviews (2024). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/38345088/
Chao et al. — Nutrients (2023). [Meta-analysis (15 RCTs)]. https://pubmed.ncbi.nlm.nih.gov/37299574/
Andersen CT et al. – BMJ global health (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/36849195/
Shields A et al. – JAMA dermatology (2023). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/37878272/
Zafar MI et al. – Drugs (2023). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/36943634/
García-Rodríguez MT et al. – Advances in skin & wound care (2023). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/36537775/
Maxfield L & Crane JS — StatPearls (2023). [Textbook review]. https://pubmed.ncbi.nlm.nih.gov/29630283/
Wang L & Song Y - Frontiers in Nutrition (2022). [Umbrella Meta-Analysis]. https://www.frontiersin.org/articles/10.3389/fnut.2022.798078/
Bomer N et al. – Journal of internal medicine (2022). [Review]. https://pubmed.ncbi.nlm.nih.gov/35137472/
Tyrmi JS et al. – Human reproduction (Oxford, England) (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/34791234/
Yosaee S et al. – General hospital psychiatry (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/32829928/
Sadeghsoltani F et al. — Biol Trace Elem Res (2022). [Review]. https://pubmed.ncbi.nlm.nih.gov/34081300/
Hendricks AJ et al. – The Journal of dermatological treatment (2021). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/31106609/
Dalhoff A – Infection (2021). [Review]. https://pubmed.ncbi.nlm.nih.gov/33367978/
Camilleri M – Current opinion in clinical nutrition and metabolic care (2021). [Review]. https://pubmed.ncbi.nlm.nih.gov/34138767/
Shi C et al. – The Cochrane database of systematic reviews (2021). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/34308565/
Taghipour A et al. – Biological trace element research (2021). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/33405078/
Saeg F et al. – Plastic and reconstructive surgery (2021). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/34181622/
Neta FI et al. – Current research in pharmacology and drug discovery (2021). [Review]. https://pubmed.ncbi.nlm.nih.gov/34870148/
Dhaliwal et al. — J Drugs Dermatol (2020). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/31745908/
Liu H et al. – The Cochrane database of systematic reviews (2020). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/32356369/
Garolla A et al. – Nutrients (2020). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/32438678/
Liu H et al. – Journal of evidence-based medicine (2020). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/33034949/
Calder PC et al. – Nutrients (2020). [Review]. https://pubmed.ncbi.nlm.nih.gov/32340216/
Yee BE et al. – Dermatologic therapy (2020). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/32860489/
Pearsey HM et al. – Reviews in endocrine & metabolic disorders (2020). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/32377863/
Song YP et al. – Nutrition in clinical practice : official publication of the American Society for Parenteral and Enteral Nutrition (2020). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/32166790/
Moore ZE et al. – The Cochrane database of systematic reviews (2020). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/32677037/
Eaton JC et al. – The Cochrane database of systematic reviews (2019). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/30779870/
Doty RL – Handbook of clinical neurology (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/31604562/
Read SA et al. — Adv Nutr (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/31305906/
Ogawa Y et al. — Nutrients (2018). [Review]. https://pubmed.ncbi.nlm.nih.gov/29439479/
Hemilä — Open Forum Infect Dis (2017). [Meta-analysis (7 RCTs)]. https://pubmed.ncbi.nlm.nih.gov/28480298/
Wessels I et al. - Nutrients (2017). [Comprehensive Review]. https://pubmed.ncbi.nlm.nih.gov/29186856/
Hemilä H - JRSM Open (2017). [Meta-Analysis]. https://pubmed.ncbi.nlm.nih.gov/28515951/
Irani M et al. – Urology journal (2017). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/28853101/
Block E et al. – Natural product reports (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/28471462/
Finch CW – Nutrition in clinical practice : official publication of the American Society for Parenteral and Enteral Nutrition (2015). [Review]. https://pubmed.ncbi.nlm.nih.gov/25527182/
Michielan A et al. – Mediators of inflammation (2015). [Review]. https://pubmed.ncbi.nlm.nih.gov/26582965/
Wieringa FT et al. — PLoS One (2015). [RCT]. https://pubmed.ncbi.nlm.nih.gov/25880209/
Gupta M et al. — Dermatol Res Pract (2014). [Review]. https://pubmed.ncbi.nlm.nih.gov/25120566/
Singh M & Das RR - Cochrane Database of Systematic Reviews (2013). [Cochrane Review]. https://pubmed.ncbi.nlm.nih.gov/23775705/
Prasad AS — Adv Nutr (2013). [Review]. https://pubmed.ncbi.nlm.nih.gov/23493540/
Maret W — Adv Nutr (2013). [Review]. https://pubmed.ncbi.nlm.nih.gov/23858094/
Wessells & Brown — PLoS One (2012). [Meta-analysis of national surveys]. https://pubmed.ncbi.nlm.nih.gov/22217001/
Schagen SK et al. - Dermato-Endocrinology (2012). [Systematic Review]. https://pubmed.ncbi.nlm.nih.gov/23467449/
Rao G & Rowland K — J Fam Pract (2011). [Review]. https://pubmed.ncbi.nlm.nih.gov/21540986/
Hemila H — Open Respir Med J (2011). [SR + meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/21769305/
Saper RB & Rash R — Am Fam Physician (2009). [Review]. https://pubmed.ncbi.nlm.nih.gov/19678340/
Haase H & Rink L — Annu Rev Nutr (2009). [Review]. https://pubmed.ncbi.nlm.nih.gov/19575597/
Brown KH et al. — Food Nutr Bull (2009). [Expert review]. https://pubmed.ncbi.nlm.nih.gov/19472167/
Prasad — Mol Med (2008). [Review]. https://pubmed.ncbi.nlm.nih.gov/18587293/
Prasad AS - Molecular Medicine (2008). [Clinical Review]. https://pubmed.ncbi.nlm.nih.gov/18587227/
Solfrizzi V et al. – Journal of Alzheimer's disease : JAD (2006). [Review]. https://pubmed.ncbi.nlm.nih.gov/17119295/
Hughes S et al. – Journal of the American College of Nutrition (2006). [Review]. https://pubmed.ncbi.nlm.nih.gov/16943449/
Maret W & Sandstead HH — J Trace Elem Med Biol (2006). [Review]. https://pubmed.ncbi.nlm.nih.gov/17084463/
Mathus-Vliegen EM – The journals of gerontology. Series A, Biological sciences and medical sciences (2004). [Review]. https://pubmed.ncbi.nlm.nih.gov/15071079/
Morselli B et al. – Therapeutische Umschau. Revue therapeutique (2000). [Review]. https://pubmed.ncbi.nlm.nih.gov/10756695/
Zima T et al. – Blood purification (1999). [Review]. https://pubmed.ncbi.nlm.nih.gov/10494021/
Ackerman BH et al. – Pharmacotherapy (1997). [Review]. https://pubmed.ncbi.nlm.nih.gov/9165552/
Gramm HJ et al. – Journal of trace elements in medicine and biology : organ of the Society for Minerals and Trace Elements (GMS) (1995). [Review]. https://pubmed.ncbi.nlm.nih.gov/8846151/
Clarkson PM – Journal of sports sciences (1991). [Review]. https://pubmed.ncbi.nlm.nih.gov/1895366/
Askari A et al. – JPEN. Journal of parenteral and enteral nutrition (1980). [Review]. https://pubmed.ncbi.nlm.nih.gov/6780709/
Zinc deficiency and immunity — established (Established). [Biochemical mechanism]. General
The Benefits of Copper (Glycinate)
Chelated form
Copper is an essential trace mineral involved in energy production, connective tissue formation, iron metabolism, and nervous system function. It also contributes to normal hair and skin pigmentation. The body needs copper in very small amounts, but its roles are critical, particularly in supporting iron transport, immune function, and antioxidant defence.
Key Highlights
- Contributes to normal iron transport in the body (EFSA approved)
- Supports normal hair and skin pigmentation (EFSA approved)
- Contributes to maintenance of normal connective tissues (EFSA approved)
- Supports normal energy-yielding metabolism (EFSA approved)
- Contributes to normal functioning of the nervous system (EFSA approved)
- Supports normal function of the immune system (EFSA approved)
- Contributes to protection of cells from oxidative stress (EFSA approved)
Biochemistry Timeline
Copper supplements are well-absorbed, particularly in glycinate form. Blood levels respond within 2 to 4 weeks. Copper has a narrow optimal range (both deficiency and excess are harmful), so supplementation should be at appropriate doses, typically 1-2 mg/day.
Energy Production
Copper is a component of cytochrome c oxidase, the final enzyme in the mitochondrial electron transport chain. This makes copper directly involved in the last step of cellular energy (ATP) production. EFSA recognises that copper contributes to normal energy-yielding metabolism.
Immune and Antioxidant Function
Copper supports immune function and acts as a cofactor for superoxide dismutase (SOD), one of the body's most important antioxidant enzymes. SOD neutralises superoxide radicals, protecting cells from oxidative damage. EFSA recognises that copper contributes to normal immune function and protection of cells from oxidative stress.
Summary
Copper is an essential trace mineral with critical roles in iron transport, energy production, connective tissue maintenance, hair/skin pigmentation, immune function, and antioxidant defence. We use copper glycinate for optimal absorption. Copper works alongside iron, zinc, and other trace minerals to support overall health, with EFSA recognising multiple health claims.
FAQs
How much copper do I need?
The recommended daily intake for adults is 1 mg. The European upper limit is 5 mg per day. Most supplements provide 1-2 mg per day.
Why is copper paired with zinc?
High-dose zinc supplementation can reduce copper absorption over time. When taking zinc supplements long-term, including a small amount of copper helps maintain balance.
Is copper safe during pregnancy?
Copper is essential during pregnancy. Recommended intake is slightly higher. Follow your healthcare provider's guidance.
Research
NIH ODS — Copper Fact Sheet (2025). [Government reference]. https://ods.od.nih.gov/factsheets/Copper-HealthProfessional/
Hill B et al. – British journal of nursing (Mark Allen Publishing) (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/39969834/
Mao L et al. – Chemical Society reviews (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/40433941/
Stiles LI et al. – Clinical and experimental medicine (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/38367035/
Liu WQ et al. – Immunological reviews (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/37715546/
Podgórska A et al. – International journal of molecular sciences (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/38612631/
Diao W et al. – Wound repair and regeneration : official publication of the Wound Healing Society [and] the European Tissue Repair Society (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/37822053/
Teschke R et al. – International journal of molecular sciences (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/38731973/
Fujiwara T – [Rinsho ketsueki] The Japanese journal of clinical hematology (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/39358290/
Lopes SO et al. – Nutrients (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/36904074/
Helman SL et al. – Biometals : an international journal on the role of metal ions in biology, biochemistry, and medicine (2023). [Review]. https://pubmed.ncbi.nlm.nih.gov/35167013/
Gogna S et al. – Journal of the American Nutrition Association (2023). [Review]. https://pubmed.ncbi.nlm.nih.gov/35916491/
Kiani AK et al. – Journal of preventive medicine and hygiene (2022). [Review]. https://pubmed.ncbi.nlm.nih.gov/36479498/
Sandoval C et al. – Pharmaceutics (2022). [Review]. https://pubmed.ncbi.nlm.nih.gov/36145586/
Salvo J et al. – Burns & trauma (2022). [Review]. https://pubmed.ncbi.nlm.nih.gov/35071652/
Piroddi et al. — Nutrients (2021). [Narrative review]. https://pubmed.ncbi.nlm.nih.gov/34210051/
Cucci LM et al. – International journal of molecular sciences (2021). [Review]. https://pubmed.ncbi.nlm.nih.gov/34639045/
Gombart AF et al. – Nutrients (2020). [Review]. https://pubmed.ncbi.nlm.nih.gov/31963293/
Fujiwara T – [Rinsho ketsueki] The Japanese journal of clinical hematology (2020). [Review]. https://pubmed.ncbi.nlm.nih.gov/32759564/
Myint ZW et al. – Annals of hematology (2018). [Review]. https://pubmed.ncbi.nlm.nih.gov/29959467/
Bost et al. — J Trace Elements Med Biol (review) (2016). [Narrative review]. PubMed Review
Bost et al. — J Trace Elem Med Biol (2016). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/27473827/
Bost M et al. - Journal of Trace Elements in Medicine and Biology (2016). [Systematic Review]. https://pubmed.ncbi.nlm.nih.gov/27473827/
EFSA Panel — NDA Opinion (2015). [Regulatory / Scientific Opinion]. EFSA Register
EFSA NDA Panel — EFSA Journal (2015). [Regulatory / Scientific Opinion]. Regulatory / Foundational
Pickart L et al. – BioMed research international (2015). [Review]. https://pubmed.ncbi.nlm.nih.gov/26236730/
Gaetke LM et al. - Journal of Clinical and Experimental Hepatology (2014). [Review]. https://pubmed.ncbi.nlm.nih.gov/25755573/
Prohaska — Adv Nutr (2011). [Review]. https://pubmed.ncbi.nlm.nih.gov/22332098/
Collins et al. — Br J Nutr (2010). [Review]. https://pubmed.ncbi.nlm.nih.gov/20500926/
Collins JF et al. - Advances in Nutrition (2010). [Expert Review]. https://pubmed.ncbi.nlm.nih.gov/22043417/
Stern BR et al. - Journal of Toxicology and Environmental Health (2007). [Risk Assessment]. https://pubmed.ncbi.nlm.nih.gov/17454560/
Harvey & Baker — Br J Nutr (2005). [RCT (crossover)]. https://pubmed.ncbi.nlm.nih.gov/16115357/
Harvey LJ et al. - American Journal of Clinical Nutrition (2005). [Systematic Review]. https://pubmed.ncbi.nlm.nih.gov/15883444/
Turnlund et al. — Am J Clin Nutr (2004). [Controlled study]. https://pubmed.ncbi.nlm.nih.gov/15113722/
Black RE – The British journal of nutrition (2001). [Review]. https://pubmed.ncbi.nlm.nih.gov/11509110/
Albrektsson T et al. – European spine journal : official publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society (2001). [Review]. https://pubmed.ncbi.nlm.nih.gov/11716023/
Olivares M & Uauy R - American Journal of Clinical Nutrition (1996). [Review]. https://pubmed.ncbi.nlm.nih.gov/8610072/
May A et al. – Bailliere's clinical haematology (1994). [Review]. https://pubmed.ncbi.nlm.nih.gov/7881157/
Oski FA – Seminars in perinatology (1979). [Review]. https://pubmed.ncbi.nlm.nih.gov/395648/
39 studies — Copper (Glycinate)
NIH ODS — Copper Fact Sheet (2025). [Government reference]. https://ods.od.nih.gov/factsheets/Copper-HealthProfessional/
Hill B et al. – British journal of nursing (Mark Allen Publishing) (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/39969834/
Mao L et al. – Chemical Society reviews (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/40433941/
Stiles LI et al. – Clinical and experimental medicine (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/38367035/
Liu WQ et al. – Immunological reviews (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/37715546/
Podgórska A et al. – International journal of molecular sciences (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/38612631/
Diao W et al. – Wound repair and regeneration : official publication of the Wound Healing Society [and] the European Tissue Repair Society (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/37822053/
Teschke R et al. – International journal of molecular sciences (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/38731973/
Fujiwara T – [Rinsho ketsueki] The Japanese journal of clinical hematology (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/39358290/
Lopes SO et al. – Nutrients (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/36904074/
Helman SL et al. – Biometals : an international journal on the role of metal ions in biology, biochemistry, and medicine (2023). [Review]. https://pubmed.ncbi.nlm.nih.gov/35167013/
Gogna S et al. – Journal of the American Nutrition Association (2023). [Review]. https://pubmed.ncbi.nlm.nih.gov/35916491/
Kiani AK et al. – Journal of preventive medicine and hygiene (2022). [Review]. https://pubmed.ncbi.nlm.nih.gov/36479498/
Sandoval C et al. – Pharmaceutics (2022). [Review]. https://pubmed.ncbi.nlm.nih.gov/36145586/
Salvo J et al. – Burns & trauma (2022). [Review]. https://pubmed.ncbi.nlm.nih.gov/35071652/
Piroddi et al. — Nutrients (2021). [Narrative review]. https://pubmed.ncbi.nlm.nih.gov/34210051/
Cucci LM et al. – International journal of molecular sciences (2021). [Review]. https://pubmed.ncbi.nlm.nih.gov/34639045/
Gombart AF et al. – Nutrients (2020). [Review]. https://pubmed.ncbi.nlm.nih.gov/31963293/
Fujiwara T – [Rinsho ketsueki] The Japanese journal of clinical hematology (2020). [Review]. https://pubmed.ncbi.nlm.nih.gov/32759564/
Myint ZW et al. – Annals of hematology (2018). [Review]. https://pubmed.ncbi.nlm.nih.gov/29959467/
Bost et al. — J Trace Elements Med Biol (review) (2016). [Narrative review]. PubMed Review
Bost et al. — J Trace Elem Med Biol (2016). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/27473827/
Bost M et al. - Journal of Trace Elements in Medicine and Biology (2016). [Systematic Review]. https://pubmed.ncbi.nlm.nih.gov/27473827/
EFSA Panel — NDA Opinion (2015). [Regulatory / Scientific Opinion]. EFSA Register
EFSA NDA Panel — EFSA Journal (2015). [Regulatory / Scientific Opinion]. Regulatory / Foundational
Pickart L et al. – BioMed research international (2015). [Review]. https://pubmed.ncbi.nlm.nih.gov/26236730/
Gaetke LM et al. - Journal of Clinical and Experimental Hepatology (2014). [Review]. https://pubmed.ncbi.nlm.nih.gov/25755573/
Prohaska — Adv Nutr (2011). [Review]. https://pubmed.ncbi.nlm.nih.gov/22332098/
Collins et al. — Br J Nutr (2010). [Review]. https://pubmed.ncbi.nlm.nih.gov/20500926/
Collins JF et al. - Advances in Nutrition (2010). [Expert Review]. https://pubmed.ncbi.nlm.nih.gov/22043417/
Stern BR et al. - Journal of Toxicology and Environmental Health (2007). [Risk Assessment]. https://pubmed.ncbi.nlm.nih.gov/17454560/
Harvey & Baker — Br J Nutr (2005). [RCT (crossover)]. https://pubmed.ncbi.nlm.nih.gov/16115357/
Harvey LJ et al. - American Journal of Clinical Nutrition (2005). [Systematic Review]. https://pubmed.ncbi.nlm.nih.gov/15883444/
Turnlund et al. — Am J Clin Nutr (2004). [Controlled study]. https://pubmed.ncbi.nlm.nih.gov/15113722/
Black RE – The British journal of nutrition (2001). [Review]. https://pubmed.ncbi.nlm.nih.gov/11509110/
Albrektsson T et al. – European spine journal : official publication of the European Spine Society, the European Spinal Deformity Society, and the European Section of the Cervical Spine Research Society (2001). [Review]. https://pubmed.ncbi.nlm.nih.gov/11716023/
Olivares M & Uauy R - American Journal of Clinical Nutrition (1996). [Review]. https://pubmed.ncbi.nlm.nih.gov/8610072/
May A et al. – Bailliere's clinical haematology (1994). [Review]. https://pubmed.ncbi.nlm.nih.gov/7881157/
Oski FA – Seminars in perinatology (1979). [Review]. https://pubmed.ncbi.nlm.nih.gov/395648/
The Benefits of Manganese
Highly Bioavailable
We use Manganese Citrate Buffered for its high bioavailability and gentle nature on the digestive system. It is a key mineral for bone formation and metabolic processes.
Key Highlights
- Essential trace mineral for enzyme function
- Supports normal connective tissue formation
- Contributes to normal iron transport in the body (EFSA approved)
- Plays a role in maintaining the normal function of the immune system
Biochemistry Timeline
Manganese is absorbed in the small intestine, though absorption rates are relatively low (1 to 5%). Once absorbed, it is distributed to tissues including bone, liver, and kidneys, where it serves as a cofactor for enzymes involved in bone formation, energy metabolism, and antioxidant defence. Manganese works alongside other minerals over time to support these processes.
Summary
Manganese is a trace mineral that contributes to normal bone formation, energy metabolism, and the protection of cells from oxidative stress. While needed in very small amounts, it plays essential roles in enzyme function throughout the body. Most people obtain adequate manganese from a varied diet rich in whole grains, nuts, and leafy greens.
FAQs
How much manganese do I need?
The adequate intake for adults is approximately 3 mg per day. Most people get sufficient manganese from dietary sources including whole grains, nuts, seeds, tea, and leafy vegetables.
Can manganese interact with iron absorption?
Yes, manganese and iron share some absorption pathways. Taking very high doses of either mineral may reduce absorption of the other. At normal supplemental doses, this interaction is not typically significant.
Research
NIH ODS — Manganese Fact Sheet (2025). [Government reference]. https://ods.od.nih.gov/factsheets/Manganese-HealthProfessional/
Ainyanbhor IE et al. – Journal of trace elements in medicine and biology : organ of the Society for Minerals and Trace Elements (GMS) (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/40743625/
Jomova K et al. – Archives of toxicology (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/39567405/
Wang R et al. – Molecular nutrition & food research (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/39440586/
Taskozhina G et al. – Journal of clinical medicine (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/39200820/
Wróblewski M et al. – International journal of molecular sciences (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/39273356/
Tuell DS et al. – Antioxidants (Basel, Switzerland) (2023). [Review]. https://pubmed.ncbi.nlm.nih.gov/37371869/
Chen et al. — BMC Musculoskelet Disord (2022). [Cross-sectional (NHANES)].
Jomova K et al. – Chemico-biological interactions (2022). [Review]. https://pubmed.ncbi.nlm.nih.gov/36152810/
Abdelrahman MM et al. – Animals : an open access journal from MDPI (2022). [Review]. https://pubmed.ncbi.nlm.nih.gov/36009706/
Rondanelli et al. — Nat Prod Commun (2021). [Narrative review].
Rius-Pérez S et al. – Oxidative medicine and cellular longevity (2020). [Review]. https://pubmed.ncbi.nlm.nih.gov/32215168/
Erikson KM & Aschner M - Pharmacology & Therapeutics (2019). [Expert Review]. Safety
Mirnamniha M et al. – Reviews on environmental health (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/31203261/
Li & Yang — Nutrients (MDPI review) (2018). [Systematic review]. MDPI Nutrients
Li & Yang — Nutrients (2018). [Review]. General
Li L & Yang X - Asia Pacific Journal of Clinical Nutrition (2018). [Meta-Analysis]. https://pubmed.ncbi.nlm.nih.gov/29737802/
Chen P et al. – Frontiers in bioscience (Landmark edition) (2018). [Review]. https://pubmed.ncbi.nlm.nih.gov/29293455/
Bevan R et al. – Neurotoxicology (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/27519548/
Peres TV et al. - International Journal of Environmental Research and Public Health (2016). [Systematic Review]. https://pubmed.ncbi.nlm.nih.gov/27898046/
Zeng X et al. – Chemosphere (2016). [Review]. https://pubmed.ncbi.nlm.nih.gov/26829309/
Chen P et al. - Journal of Neurochemistry (2015). [Review]. https://pubmed.ncbi.nlm.nih.gov/25711369/
Claus Henn B et al. – Current opinion in pediatrics (2014). [Review]. https://pubmed.ncbi.nlm.nih.gov/24535499/
Kaur B et al. – Advances in food and nutrition research (2014). [Review]. https://pubmed.ncbi.nlm.nih.gov/24484939/
EFSA NDA Panel — EFSA Journal (2013). [Regulatory / Scientific Opinion]. Regulatory / Foundational
Pizent A et al. – Arhiv za higijenu rada i toksikologiju (2012). [Review]. https://pubmed.ncbi.nlm.nih.gov/22548851/
Fukai T et al. – Antioxidants & redox signaling (2011). [Review]. https://pubmed.ncbi.nlm.nih.gov/21473702/
Wirth JJ et al. – Systems biology in reproductive medicine (2010). [Review]. https://pubmed.ncbi.nlm.nih.gov/20377313/
EFSA Panel — NDA Opinion (2009/2012). [Regulatory / Scientific Opinion]. EFSA Register
Aschner & Aschner — Crit Rev Toxicol (2005). [Review]. https://pubmed.ncbi.nlm.nih.gov/16252996/
Aschner JL & Aschner M - Molecular Aspects of Medicine (2005). [Comprehensive Review]. https://pubmed.ncbi.nlm.nih.gov/16105678/
Crossgrove J et al. – NMR in biomedicine (2004). [Review]. https://pubmed.ncbi.nlm.nih.gov/15617053/
Zelko IN et al. – Free radical biology & medicine (2002). [Review]. https://pubmed.ncbi.nlm.nih.gov/12126755/
Branca F et al. – Public health nutrition (2001). [Review]. https://pubmed.ncbi.nlm.nih.gov/11255501/
Keen CL et al. - Neurotoxicology (2000). [Review]. https://pubmed.ncbi.nlm.nih.gov/10868510/
Penland & Johnson — Am J Clin Nutr (1993). [Controlled dietary study].
36 studies — Manganese
NIH ODS — Manganese Fact Sheet (2025). [Government reference]. https://ods.od.nih.gov/factsheets/Manganese-HealthProfessional/
Ainyanbhor IE et al. – Journal of trace elements in medicine and biology : organ of the Society for Minerals and Trace Elements (GMS) (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/40743625/
Jomova K et al. – Archives of toxicology (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/39567405/
Wang R et al. – Molecular nutrition & food research (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/39440586/
Taskozhina G et al. – Journal of clinical medicine (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/39200820/
Wróblewski M et al. – International journal of molecular sciences (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/39273356/
Tuell DS et al. – Antioxidants (Basel, Switzerland) (2023). [Review]. https://pubmed.ncbi.nlm.nih.gov/37371869/
Chen et al. — BMC Musculoskelet Disord (2022). [Cross-sectional (NHANES)].
Jomova K et al. – Chemico-biological interactions (2022). [Review]. https://pubmed.ncbi.nlm.nih.gov/36152810/
Abdelrahman MM et al. – Animals : an open access journal from MDPI (2022). [Review]. https://pubmed.ncbi.nlm.nih.gov/36009706/
Rondanelli et al. — Nat Prod Commun (2021). [Narrative review].
Rius-Pérez S et al. – Oxidative medicine and cellular longevity (2020). [Review]. https://pubmed.ncbi.nlm.nih.gov/32215168/
Erikson KM & Aschner M - Pharmacology & Therapeutics (2019). [Expert Review]. Safety
Mirnamniha M et al. – Reviews on environmental health (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/31203261/
Li & Yang — Nutrients (MDPI review) (2018). [Systematic review]. MDPI Nutrients
Li & Yang — Nutrients (2018). [Review]. General
Li L & Yang X - Asia Pacific Journal of Clinical Nutrition (2018). [Meta-Analysis]. https://pubmed.ncbi.nlm.nih.gov/29737802/
Chen P et al. – Frontiers in bioscience (Landmark edition) (2018). [Review]. https://pubmed.ncbi.nlm.nih.gov/29293455/
Bevan R et al. – Neurotoxicology (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/27519548/
Peres TV et al. - International Journal of Environmental Research and Public Health (2016). [Systematic Review]. https://pubmed.ncbi.nlm.nih.gov/27898046/
Zeng X et al. – Chemosphere (2016). [Review]. https://pubmed.ncbi.nlm.nih.gov/26829309/
Chen P et al. - Journal of Neurochemistry (2015). [Review]. https://pubmed.ncbi.nlm.nih.gov/25711369/
Claus Henn B et al. – Current opinion in pediatrics (2014). [Review]. https://pubmed.ncbi.nlm.nih.gov/24535499/
Kaur B et al. – Advances in food and nutrition research (2014). [Review]. https://pubmed.ncbi.nlm.nih.gov/24484939/
EFSA NDA Panel — EFSA Journal (2013). [Regulatory / Scientific Opinion]. Regulatory / Foundational
Pizent A et al. – Arhiv za higijenu rada i toksikologiju (2012). [Review]. https://pubmed.ncbi.nlm.nih.gov/22548851/
Fukai T et al. – Antioxidants & redox signaling (2011). [Review]. https://pubmed.ncbi.nlm.nih.gov/21473702/
Wirth JJ et al. – Systems biology in reproductive medicine (2010). [Review]. https://pubmed.ncbi.nlm.nih.gov/20377313/
EFSA Panel — NDA Opinion (2009/2012). [Regulatory / Scientific Opinion]. EFSA Register
Aschner & Aschner — Crit Rev Toxicol (2005). [Review]. https://pubmed.ncbi.nlm.nih.gov/16252996/
Aschner JL & Aschner M - Molecular Aspects of Medicine (2005). [Comprehensive Review]. https://pubmed.ncbi.nlm.nih.gov/16105678/
Crossgrove J et al. – NMR in biomedicine (2004). [Review]. https://pubmed.ncbi.nlm.nih.gov/15617053/
Zelko IN et al. – Free radical biology & medicine (2002). [Review]. https://pubmed.ncbi.nlm.nih.gov/12126755/
Branca F et al. – Public health nutrition (2001). [Review]. https://pubmed.ncbi.nlm.nih.gov/11255501/
Keen CL et al. - Neurotoxicology (2000). [Review]. https://pubmed.ncbi.nlm.nih.gov/10868510/
Penland & Johnson — Am J Clin Nutr (1993). [Controlled dietary study].
The Benefits of Selenium
Natural form
Selenium is an essential trace mineral with powerful antioxidant properties. It plays a vital role in thyroid health, immune function, and protecting cells from oxidative damage. The thyroid gland contains more selenium per gram of tissue than any other organ in the body, reflecting how important this mineral is for hormonal balance.
Key Highlights
- Contributes to normal thyroid function (EFSA approved)
- Supports the protection of cells from oxidative stress (EFSA approved)
- Contributes to normal function of the immune system (EFSA approved)
- Supports maintenance of normal hair and nails (EFSA approved)
- Contributes to normal spermatogenesis (EFSA approved)
- Thyroid gland contains more selenium per gram than any other organ
Biochemistry Timeline
Selenium supplementation can begin to influence selenoprotein activity within 2 to 4 weeks. For thyroid-related benefits, research suggests consistent supplementation for at least 3 months to see meaningful changes in thyroid antibody levels.
Selenium has a relatively narrow optimal range. The EFSA upper limit is 255 µg per day, and most supplements provide 55-200 µg per day. Blood selenium levels can be measured to assess status and guide appropriate supplementation.
Hair and Nail Health
Selenium contributes to the maintenance of normal hair and nails, an EFSA-approved health claim. Hair follicles and nail beds require adequate selenium for healthy growth, and deficiency has been associated with hair thinning and brittle nails.
Because thyroid health also directly affects hair and nail quality, selenium's dual role in supporting thyroid function and providing antioxidant protection makes it particularly valuable for those experiencing hair or nail concerns, especially when thyroid function may be a contributing factor.
Reproductive Health
Selenium plays a role in reproductive health for both women and men. EFSA recognises that selenium contributes to normal spermatogenesis (sperm production). For women, selenium's role in thyroid health is particularly relevant, as thyroid function is closely linked to menstrual regularity and fertility.
Adequate selenium status supports the hormonal balance and antioxidant protection that are important throughout the reproductive years and during pregnancy. If you are planning a pregnancy, ensuring adequate selenium intake, alongside other key nutrients, is a thoughtful step in preparation.
Summary
Selenium is an essential trace mineral that supports thyroid health, immune function, antioxidant protection, and the maintenance of healthy hair and nails. The thyroid gland relies heavily on selenium for hormone conversion, making it especially relevant for the many women affected by autoimmune thyroid conditions.
Found in foods like Brazil nuts, fish, and eggs, selenium intake can vary depending on regional soil levels. Supplementation at appropriate doses (typically 55-200 µg/day) offers a reliable way to maintain adequate selenium status, with benefits for thyroid antibody levels typically seen within 3 months of consistent use.
FAQs
How much selenium do I need?
The recommended intake for adults is 55-70 µg per day. The European upper limit is 255 µg per day. Supplementation typically provides 55-200 µg per day, depending on your dietary intake and health goals.
Can I get enough selenium from Brazil nuts alone?
Brazil nuts are the richest natural source of selenium, with just 1-2 nuts potentially providing your daily needs. However, selenium content varies significantly between nuts depending on the soil where they were grown, so relying solely on Brazil nuts can result in inconsistent intake.
Is selenium helpful for thyroid conditions?
Research supports selenium supplementation for autoimmune thyroid conditions, particularly Hashimoto's thyroiditis, where it has been shown to reduce thyroid antibodies. If you have a thyroid condition, discuss selenium supplementation with your healthcare provider as part of your overall management plan.
Are there risks of taking too much selenium?
Yes, selenium has a relatively narrow range between adequacy and excess. Symptoms of excess selenium (selenosis) can include garlic breath, hair loss, and nail changes. Staying within recommended supplementation levels and the EFSA upper limit of 255 µg/day is important.
Is selenium safe during pregnancy?
Selenium is considered safe during pregnancy at recommended doses. Adequate selenium supports thyroid function and antioxidant protection for both mother and baby. Consult your healthcare provider for personalised guidance.
Research
Kyriakou SI et al. – International journal of molecular sciences (2026). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/41596613/
NIH ODS — Selenium Fact Sheet (2025). [Government reference]. https://ods.od.nih.gov/factsheets/Selenium-HealthProfessional/
Natarelli N et al. – Journal of medicinal food (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/39804624/
Chen J et al. – Toxicology letters (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/40829714/
Dorczok MC et al. – Nutrients (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/39940333/
Bjørklund G et al. – Current medicinal chemistry (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/40045862/
Bjørklund G et al. – Journal of trace elements in medicine and biology : organ of the Society for Minerals and Trace Elements (GMS) (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/40460725/
Zhang H et al. – Medicine (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/40898469/
Huwiler et al. — Thyroid (2024). [SR + meta-analysis (35 RCTs)]. https://pmc.ncbi.nlm.nih.gov/articles/PMC10951571/
Selenoprotein review — immune function (2024). [Narrative review]. General
Huwiler et al. — Thyroid (2024). [Systematic review & MA (35 RCTs)]. https://pmc.ncbi.nlm.nih.gov/articles/PMC10951571/
Huwiler VV et al. – Thyroid : official journal of the American Thyroid Association (2024). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/38243784/
Norouzi M et al. – Nutrition and cancer (2024). [RCT]. https://pubmed.ncbi.nlm.nih.gov/38105612/
Peng B et al. – Frontiers in endocrinology (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/39698034/
Gholizadeh M et al. – Journal of trace elements in medicine and biology : organ of the Society for Minerals and Trace Elements (GMS) (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/37257335/
Zhao J et al. – BMC endocrine disorders (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/36740666/
Wang YS et al. – Nutrients (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/37513612/
Silva I et al. – The British journal of nutrition (2023). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/36408672/
Kong XQ et al. – Medicine (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/37335715/
Fan Y et al. — Biol Trace Elem Res (2023). [SR + meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/36066765/
Lin Y et al. – Nutrients (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/35267927/
Sharma AP et al. – Urology (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/34871624/
Pereira ME et al. – Nutrients (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/35956381/
Barchielli G et al. — Antioxidants (2022). [Review]. https://pubmed.ncbi.nlm.nih.gov/35624695/
Schomburg L — Nat Rev Endocrinol (2022). [Expert review]. https://pubmed.ncbi.nlm.nih.gov/34880437/
Zuo Y et al. – Annals of palliative medicine (2021). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/33894732/
Parohan M et al. – Nutritional neuroscience (2021). [RCT]. https://pubmed.ncbi.nlm.nih.gov/31241007/
Santos LR et al. — Nutrients (2021). [Review]. https://pubmed.ncbi.nlm.nih.gov/33671141/
Winther et al. — Environ Int (2020). [Cross-sectional]. General
Kuria A et al. - BMC Endocrine Disorders (2020). [Cochrane-style SR]. https://pubmed.ncbi.nlm.nih.gov/33372610/
Zhao XH et al. – Asian journal of psychiatry (2020). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/32927309/
Bohnet HG – Therapeutic drug monitoring (2020). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/31425445/
Zhang Y et al. – Human reproduction update (2020). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/32045470/
Kim DY et al. – Journal of translational medicine (2020). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/31906979/
Lv J et al. – Journal of trace elements in medicine and biology : organ of the Society for Minerals and Trace Elements (GMS) (2020). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/32497930/
Jayawardena R et al. – Diabetes & metabolic syndrome (2020). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/32334392/
Winther KH et al. — Endocr Rev (2020). [Review]. https://pubmed.ncbi.nlm.nih.gov/32009168/
Buhling K et al. – Reproductive biomedicine online (2019). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/31160241/
Zhang X et al. – Medicine (2019). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/31192915/
Almohanna HM et al. – Dermatology and therapy (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/30547302/
Varikasuvu SR et al. – Biological trace element research (2019). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/30171594/
Sayehmiri K et al. – Asian Pacific journal of cancer prevention : APJCP (2018). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/29936712/
Salas-Huetos A et al. – Advances in nutrition (Bethesda, Md.) (2018). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/30462179/
Vinceti M et al. – The Cochrane database of systematic reviews (2018). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/29376219/
Yu V et al. – Skin appendage disorders (2018). [Review]. https://pubmed.ncbi.nlm.nih.gov/30410891/
Vinceti M et al. — Cochrane Database Syst Rev (2018). [Cochrane review]. https://pubmed.ncbi.nlm.nih.gov/29376219/
Showell MG et al. – The Cochrane database of systematic reviews (2017). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/28752910/
Salas-Huetos A et al. – Human reproduction update (2017). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/28333357/
Thompson JM et al. – American journal of clinical dermatology (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/28508256/
Kieliszek M & Blazejak S — Molecules (2016). [Review]. https://pubmed.ncbi.nlm.nih.gov/27043534/
Autoimmune thyroid sex difference review (2015). [Review / Hypothesis]. https://pubmed.ncbi.nlm.nih.gov/25576242/
Stoffaneller & Morse — Nutrients (2015). [Review]. https://pubmed.ncbi.nlm.nih.gov/25988760/
Winther KH et al. - European Journal of Endocrinology (2015). [Meta-Analysis]. https://pubmed.ncbi.nlm.nih.gov/26444987/
Duntas LH & Benvenga S — Endocrine (2015). [Review]. https://pubmed.ncbi.nlm.nih.gov/25869537/
Stoffaneller R & Morse NL — Nutrients (2015). [Review]. https://pubmed.ncbi.nlm.nih.gov/25835046/
Steinbrenner H et al. — Adv Nutr (2015). [Review]. https://pubmed.ncbi.nlm.nih.gov/25568042/
Wu Q et al. — J Biol Chem (2015). [Review]. https://pubmed.ncbi.nlm.nih.gov/25957410/
Rayman MP & Stranges S — Free Radic Biol Med (2013). [Review]. https://pubmed.ncbi.nlm.nih.gov/23395779/
Rayman — Lancet (2012). [Review]. https://pubmed.ncbi.nlm.nih.gov/22381456/
Rayman MP — Lancet (2012). [Seminar]. https://pubmed.ncbi.nlm.nih.gov/22381456/
Toulis et al. — Thyroid (2010). [SR + meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/20883174/
Hurst et al. — Am J Clin Nutr (2010). [RCT (dose-response)]. https://pubmed.ncbi.nlm.nih.gov/20357044/
Daniells S et al. – Current opinion in clinical nutrition and metabolic care (2010). [Review]. https://pubmed.ncbi.nlm.nih.gov/20823774/
Lippman SM et al. - JAMA (SELECT) (2009). [Landmark RCT]. https://pubmed.ncbi.nlm.nih.gov/19066370/
Bleys J et al. — Arch Intern Med (2008). [Prospective cohort]. https://pubmed.ncbi.nlm.nih.gov/18347289/
65 studies — Selenium
Kyriakou SI et al. – International journal of molecular sciences (2026). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/41596613/
NIH ODS — Selenium Fact Sheet (2025). [Government reference]. https://ods.od.nih.gov/factsheets/Selenium-HealthProfessional/
Natarelli N et al. – Journal of medicinal food (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/39804624/
Chen J et al. – Toxicology letters (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/40829714/
Dorczok MC et al. – Nutrients (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/39940333/
Bjørklund G et al. – Current medicinal chemistry (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/40045862/
Bjørklund G et al. – Journal of trace elements in medicine and biology : organ of the Society for Minerals and Trace Elements (GMS) (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/40460725/
Zhang H et al. – Medicine (2025). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/40898469/
Huwiler et al. — Thyroid (2024). [SR + meta-analysis (35 RCTs)]. https://pmc.ncbi.nlm.nih.gov/articles/PMC10951571/
Selenoprotein review — immune function (2024). [Narrative review]. General
Huwiler et al. — Thyroid (2024). [Systematic review & MA (35 RCTs)]. https://pmc.ncbi.nlm.nih.gov/articles/PMC10951571/
Huwiler VV et al. – Thyroid : official journal of the American Thyroid Association (2024). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/38243784/
Norouzi M et al. – Nutrition and cancer (2024). [RCT]. https://pubmed.ncbi.nlm.nih.gov/38105612/
Peng B et al. – Frontiers in endocrinology (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/39698034/
Gholizadeh M et al. – Journal of trace elements in medicine and biology : organ of the Society for Minerals and Trace Elements (GMS) (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/37257335/
Zhao J et al. – BMC endocrine disorders (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/36740666/
Wang YS et al. – Nutrients (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/37513612/
Silva I et al. – The British journal of nutrition (2023). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/36408672/
Kong XQ et al. – Medicine (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/37335715/
Fan Y et al. — Biol Trace Elem Res (2023). [SR + meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/36066765/
Lin Y et al. – Nutrients (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/35267927/
Sharma AP et al. – Urology (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/34871624/
Pereira ME et al. – Nutrients (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/35956381/
Barchielli G et al. — Antioxidants (2022). [Review]. https://pubmed.ncbi.nlm.nih.gov/35624695/
Schomburg L — Nat Rev Endocrinol (2022). [Expert review]. https://pubmed.ncbi.nlm.nih.gov/34880437/
Zuo Y et al. – Annals of palliative medicine (2021). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/33894732/
Parohan M et al. – Nutritional neuroscience (2021). [RCT]. https://pubmed.ncbi.nlm.nih.gov/31241007/
Santos LR et al. — Nutrients (2021). [Review]. https://pubmed.ncbi.nlm.nih.gov/33671141/
Winther et al. — Environ Int (2020). [Cross-sectional]. General
Kuria A et al. - BMC Endocrine Disorders (2020). [Cochrane-style SR]. https://pubmed.ncbi.nlm.nih.gov/33372610/
Zhao XH et al. – Asian journal of psychiatry (2020). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/32927309/
Bohnet HG – Therapeutic drug monitoring (2020). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/31425445/
Zhang Y et al. – Human reproduction update (2020). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/32045470/
Kim DY et al. – Journal of translational medicine (2020). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/31906979/
Lv J et al. – Journal of trace elements in medicine and biology : organ of the Society for Minerals and Trace Elements (GMS) (2020). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/32497930/
Jayawardena R et al. – Diabetes & metabolic syndrome (2020). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/32334392/
Winther KH et al. — Endocr Rev (2020). [Review]. https://pubmed.ncbi.nlm.nih.gov/32009168/
Buhling K et al. – Reproductive biomedicine online (2019). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/31160241/
Zhang X et al. – Medicine (2019). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/31192915/
Almohanna HM et al. – Dermatology and therapy (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/30547302/
Varikasuvu SR et al. – Biological trace element research (2019). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/30171594/
Sayehmiri K et al. – Asian Pacific journal of cancer prevention : APJCP (2018). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/29936712/
Salas-Huetos A et al. – Advances in nutrition (Bethesda, Md.) (2018). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/30462179/
Vinceti M et al. – The Cochrane database of systematic reviews (2018). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/29376219/
Yu V et al. – Skin appendage disorders (2018). [Review]. https://pubmed.ncbi.nlm.nih.gov/30410891/
Vinceti M et al. — Cochrane Database Syst Rev (2018). [Cochrane review]. https://pubmed.ncbi.nlm.nih.gov/29376219/
Showell MG et al. – The Cochrane database of systematic reviews (2017). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/28752910/
Salas-Huetos A et al. – Human reproduction update (2017). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/28333357/
Thompson JM et al. – American journal of clinical dermatology (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/28508256/
Kieliszek M & Blazejak S — Molecules (2016). [Review]. https://pubmed.ncbi.nlm.nih.gov/27043534/
Autoimmune thyroid sex difference review (2015). [Review / Hypothesis]. https://pubmed.ncbi.nlm.nih.gov/25576242/
Stoffaneller & Morse — Nutrients (2015). [Review]. https://pubmed.ncbi.nlm.nih.gov/25988760/
Winther KH et al. - European Journal of Endocrinology (2015). [Meta-Analysis]. https://pubmed.ncbi.nlm.nih.gov/26444987/
Duntas LH & Benvenga S — Endocrine (2015). [Review]. https://pubmed.ncbi.nlm.nih.gov/25869537/
Stoffaneller R & Morse NL — Nutrients (2015). [Review]. https://pubmed.ncbi.nlm.nih.gov/25835046/
Steinbrenner H et al. — Adv Nutr (2015). [Review]. https://pubmed.ncbi.nlm.nih.gov/25568042/
Wu Q et al. — J Biol Chem (2015). [Review]. https://pubmed.ncbi.nlm.nih.gov/25957410/
Rayman MP & Stranges S — Free Radic Biol Med (2013). [Review]. https://pubmed.ncbi.nlm.nih.gov/23395779/
Rayman — Lancet (2012). [Review]. https://pubmed.ncbi.nlm.nih.gov/22381456/
Rayman MP — Lancet (2012). [Seminar]. https://pubmed.ncbi.nlm.nih.gov/22381456/
Toulis et al. — Thyroid (2010). [SR + meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/20883174/
Hurst et al. — Am J Clin Nutr (2010). [RCT (dose-response)]. https://pubmed.ncbi.nlm.nih.gov/20357044/
Daniells S et al. – Current opinion in clinical nutrition and metabolic care (2010). [Review]. https://pubmed.ncbi.nlm.nih.gov/20823774/
Lippman SM et al. - JAMA (SELECT) (2009). [Landmark RCT]. https://pubmed.ncbi.nlm.nih.gov/19066370/
Bleys J et al. — Arch Intern Med (2008). [Prospective cohort]. https://pubmed.ncbi.nlm.nih.gov/18347289/
The Benefits of Chromium
Bioavailable From
We use Chromium Picolinate for its superior bioavailability, that is easily absorbed and utilized by the body to support normal macronutrient metabolism.
Key Highlights
- Contributes to normal macronutrient metabolism
- Helps maintain normal blood glucose levels (EFSA approved)
- Supports insulin sensitivity
- Involved in carbohydrate, fat, and protein metabolism
Biochemistry Timeline
Chromium is absorbed in the small intestine, though absorption rates are relatively low (0.4 to 2.5% of dietary intake). Once absorbed, it is transported in the blood bound to transferrin. Chromium's effects on blood glucose management are gradual. Most studies observe meaningful changes over 8 to 16 weeks of consistent supplementation.
Summary
Chromium is a trace mineral that contributes to normal macronutrient metabolism and helps maintain normal blood glucose levels. While severe deficiency is rare, ensuring adequate intake supports your body's natural ability to process carbohydrates and maintain steady energy throughout the day.
FAQs
How much chromium do I need daily?
The EU adequate intake for adults is 25 to 35 micrograms per day. Most people get sufficient chromium from a varied diet that includes whole grains, broccoli, and lean meats.
Is chromium safe to take long term?
At recommended doses, chromium supplementation is generally considered safe for long-term use. The trivalent form (chromium picolinate or chromium chloride) used in supplements has a strong safety profile.
Does chromium help with weight management?
While chromium plays a role in macronutrient metabolism, the evidence for chromium supplements directly causing weight loss is limited. It may support healthy metabolism as part of a balanced lifestyle.
Research
Hamsho et al. — Endocrinología (ScienceDirect) (2025). [Meta-analysis (10 RCTs)]. https://pubmed.ncbi.nlm.nih.gov/41067797/
Alavijeh et al. — Endocr Metab Immune Disord (2025). [Meta-analysis (10 RCTs)]. https://pubmed.ncbi.nlm.nih.gov/41067797/
Gholami A et al. – Biological trace element research (2025). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/39671146/
Monfared V et al. – Journal of trace elements in medicine and biology : organ of the Society for Minerals and Trace Elements (GMS) (2025). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/40245649/
Zhao G et al. – Reproductive biology and endocrinology : RB&E (2025). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/40611279/
Systematic Review — Chromium on insulin resistance (2024). [Systematic review & MA (20 RCTs)]. https://www.asianinstituteofresearch.org/JHMSarchives/the-effect-of-chromium-supplements-on-insulin-resistance
Dose-response MA — JACC Advances (2024). [Dose-response MA (64 RCTs)]. https://www.jacc.org/doi/10.1016/j.jacadv.2023.100729
Malik MI et al. – Journal of dairy science (2024). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/37709042/
Vajdi M et al. – Journal of trace elements in medicine and biology : organ of the Society for Minerals and Trace Elements (GMS) (2024). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/37952433/
Pokorska-Niewiada K et al. – Ginekologia polska (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/37713235/
Timbó ICG et al. – The Journal of prosthetic dentistry (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/36357193/
Vajdi et al. — Biol Trace Elem Res (2023). [Umbrella review]. https://pubmed.ncbi.nlm.nih.gov/36376714/
Xia J et al. – Pharmacological research (2023). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/36638933/
Kim Y et al. – Archives of pharmacal research (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/35304727/
Asbaghi et al. — Pharmacol Res (2020). [Meta-analysis (25 RCTs)]. https://pubmed.ncbi.nlm.nih.gov/32553908/
Frauchiger et al. — Curr Diabetes Rev (2020). [Systematic review]. General
Asbaghi O et al. – Pharmacological research (2020). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/32730903/
Jamilian M et al. – Biological trace element research (2020). [RCT]. https://pubmed.ncbi.nlm.nih.gov/30977089/
Baj J et al. – International journal of molecular sciences (2020). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/33334078/
Asbaghi O et al. — Pharmacol Res (2020). [SR + meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/32092397/
Jamilian et al. — Frontiers in Endocrinology (2018). [RCT (double-blind, placebo-controlled)]. https://www.frontiersin.org/journals/endocrinology/articles/10.3389/fendo.2018.00726/full
Tang et al. — J Obstet Gynaecol Res (2018). [Meta-analysis (6 RCTs)]. https://pubmed.ncbi.nlm.nih.gov/28929602/
Heshmati et al. — Horm Metab Res (2018). [Meta-analysis (5 RCTs)]. https://pubmed.ncbi.nlm.nih.gov/29523006/
Fazelian et al. — J Trace Elem Med Biol (2017). [Systematic review & meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/28595797/
Vincent JB - Nutrition Reviews (2017). [Expert Review]. Metabolic Health
Muss C et al. – Neuro endocrinology letters (2016). [RCT]. https://pubmed.ncbi.nlm.nih.gov/26994381/
Yin RV & Phung OJ - Journal of Pharmacy Practice (2015). [Meta-Analysis]. https://pubmed.ncbi.nlm.nih.gov/26092161/
EFSA NDA Panel — EFSA Journal (2014). [Regulatory / Scientific Opinion]. Regulatory / Foundational
Suksomboon N et al. - Journal of Clinical Pharmacy and Therapeutics (2014). [Meta-Analysis]. https://pubmed.ncbi.nlm.nih.gov/24635480/
EFSA Panel - EFSA Journal (2014). [Scientific Opinion]. Regulatory
Suksomboon N et al. — J Clin Pharm Ther (2014). [SR + meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/25180019/
Tian H et al. – The Cochrane database of systematic reviews (2013). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/24293292/
Sylvia LG et al. – Psychotherapy and psychosomatics (2013). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/23147067/
Brownley KA et al. – Journal of psychosomatic research (2013). [RCT]. https://pubmed.ncbi.nlm.nih.gov/23751236/
Brownley KA et al. – Journal of dietary supplements (2013). [RCT]. https://pubmed.ncbi.nlm.nih.gov/24237190/
Parsons A et al. – Drug and alcohol dependence (2009). [RCT]. https://pubmed.ncbi.nlm.nih.gov/19328636/
Docherty JP et al. – Journal of psychiatric practice (2005). [RCT]. https://pubmed.ncbi.nlm.nih.gov/16184071/
Frank MG et al. – Psychological medicine (2004). [RCT]. https://pubmed.ncbi.nlm.nih.gov/15259834/
Davidson JR et al. – Biological psychiatry (2003). [RCT]. https://pubmed.ncbi.nlm.nih.gov/12559660/
Vincent JB — Nutr Rev (2000). [Review]. https://pubmed.ncbi.nlm.nih.gov/10885323/
Anderson RA — Diabetes Technol Ther (2000). [Review]. https://pubmed.ncbi.nlm.nih.gov/11467671/
Chromium picolinate mechanism — established (Established). [Established science].
42 studies — Chromium
Hamsho et al. — Endocrinología (ScienceDirect) (2025). [Meta-analysis (10 RCTs)]. https://pubmed.ncbi.nlm.nih.gov/41067797/
Alavijeh et al. — Endocr Metab Immune Disord (2025). [Meta-analysis (10 RCTs)]. https://pubmed.ncbi.nlm.nih.gov/41067797/
Gholami A et al. – Biological trace element research (2025). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/39671146/
Monfared V et al. – Journal of trace elements in medicine and biology : organ of the Society for Minerals and Trace Elements (GMS) (2025). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/40245649/
Zhao G et al. – Reproductive biology and endocrinology : RB&E (2025). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/40611279/
Systematic Review — Chromium on insulin resistance (2024). [Systematic review & MA (20 RCTs)]. https://www.asianinstituteofresearch.org/JHMSarchives/the-effect-of-chromium-supplements-on-insulin-resistance
Dose-response MA — JACC Advances (2024). [Dose-response MA (64 RCTs)]. https://www.jacc.org/doi/10.1016/j.jacadv.2023.100729
Malik MI et al. – Journal of dairy science (2024). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/37709042/
Vajdi M et al. – Journal of trace elements in medicine and biology : organ of the Society for Minerals and Trace Elements (GMS) (2024). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/37952433/
Pokorska-Niewiada K et al. – Ginekologia polska (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/37713235/
Timbó ICG et al. – The Journal of prosthetic dentistry (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/36357193/
Vajdi et al. — Biol Trace Elem Res (2023). [Umbrella review]. https://pubmed.ncbi.nlm.nih.gov/36376714/
Xia J et al. – Pharmacological research (2023). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/36638933/
Kim Y et al. – Archives of pharmacal research (2022). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/35304727/
Asbaghi et al. — Pharmacol Res (2020). [Meta-analysis (25 RCTs)]. https://pubmed.ncbi.nlm.nih.gov/32553908/
Frauchiger et al. — Curr Diabetes Rev (2020). [Systematic review]. General
Asbaghi O et al. – Pharmacological research (2020). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/32730903/
Jamilian M et al. – Biological trace element research (2020). [RCT]. https://pubmed.ncbi.nlm.nih.gov/30977089/
Baj J et al. – International journal of molecular sciences (2020). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/33334078/
Asbaghi O et al. — Pharmacol Res (2020). [SR + meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/32092397/
Jamilian et al. — Frontiers in Endocrinology (2018). [RCT (double-blind, placebo-controlled)]. https://www.frontiersin.org/journals/endocrinology/articles/10.3389/fendo.2018.00726/full
Tang et al. — J Obstet Gynaecol Res (2018). [Meta-analysis (6 RCTs)]. https://pubmed.ncbi.nlm.nih.gov/28929602/
Heshmati et al. — Horm Metab Res (2018). [Meta-analysis (5 RCTs)]. https://pubmed.ncbi.nlm.nih.gov/29523006/
Fazelian et al. — J Trace Elem Med Biol (2017). [Systematic review & meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/28595797/
Vincent JB - Nutrition Reviews (2017). [Expert Review]. Metabolic Health
Muss C et al. – Neuro endocrinology letters (2016). [RCT]. https://pubmed.ncbi.nlm.nih.gov/26994381/
Yin RV & Phung OJ - Journal of Pharmacy Practice (2015). [Meta-Analysis]. https://pubmed.ncbi.nlm.nih.gov/26092161/
EFSA NDA Panel — EFSA Journal (2014). [Regulatory / Scientific Opinion]. Regulatory / Foundational
Suksomboon N et al. - Journal of Clinical Pharmacy and Therapeutics (2014). [Meta-Analysis]. https://pubmed.ncbi.nlm.nih.gov/24635480/
EFSA Panel - EFSA Journal (2014). [Scientific Opinion]. Regulatory
Suksomboon N et al. — J Clin Pharm Ther (2014). [SR + meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/25180019/
Tian H et al. – The Cochrane database of systematic reviews (2013). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/24293292/
Sylvia LG et al. – Psychotherapy and psychosomatics (2013). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/23147067/
Brownley KA et al. – Journal of psychosomatic research (2013). [RCT]. https://pubmed.ncbi.nlm.nih.gov/23751236/
Brownley KA et al. – Journal of dietary supplements (2013). [RCT]. https://pubmed.ncbi.nlm.nih.gov/24237190/
Parsons A et al. – Drug and alcohol dependence (2009). [RCT]. https://pubmed.ncbi.nlm.nih.gov/19328636/
Docherty JP et al. – Journal of psychiatric practice (2005). [RCT]. https://pubmed.ncbi.nlm.nih.gov/16184071/
Frank MG et al. – Psychological medicine (2004). [RCT]. https://pubmed.ncbi.nlm.nih.gov/15259834/
Davidson JR et al. – Biological psychiatry (2003). [RCT]. https://pubmed.ncbi.nlm.nih.gov/12559660/
Vincent JB — Nutr Rev (2000). [Review]. https://pubmed.ncbi.nlm.nih.gov/10885323/
Anderson RA — Diabetes Technol Ther (2000). [Review]. https://pubmed.ncbi.nlm.nih.gov/11467671/
Chromium picolinate mechanism — established (Established). [Established science].
The Benefits of Molybdenum
Bioavailable form
We use Sodium Molybdate, a highly bioavailable form of molybdenum that helps your body efficiently utilize this essential mineral.
Key Highlights
- Contributes to normal sulphur amino acid metabolism
- Essential cofactor for several important enzymes
- Supports the body's natural detoxification processes
- Involved in processing of purines and sulphites
Biochemistry Timeline
Molybdenum is efficiently absorbed in the small intestine, with absorption rates typically between 40 and 100%. It serves as a cofactor for enzymes including xanthine oxidase, aldehyde oxidase, and sulphite oxidase. These enzymes work continuously in your body, and maintaining adequate molybdenum ensures they function normally.
Summary
Molybdenum is a trace mineral that most people have never heard of, yet it plays a quiet but important role. It serves as a cofactor for enzymes involved in processing waste products and sulfur-containing amino acids. Deficiency is extremely rare in people eating a varied diet, but it remains an essential part of the body's biochemistry.
FAQs
Do I need to supplement molybdenum?
For most people eating a varied diet, molybdenum deficiency is extremely rare. It is included in multivitamin formulas as a precaution to ensure all trace mineral needs are covered.
What foods contain molybdenum?
Legumes, grains, nuts, and leafy vegetables are good sources. The amount in plant foods depends on the soil in which they were grown.
Is molybdenum safe?
At doses found in supplements and food, molybdenum is very safe. The European tolerable upper intake level for adults is 600 micrograms per day.
Research
NIH Office of Dietary Supplements - Molybdenum Fact Sheet (2024). [Government Review]. https://ods.od.nih.gov/factsheets/Molybdenum-HealthProfessional/
Xu J et al. – Sheng wu gong cheng xue bao = Chinese journal of biotechnology (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/39467736/
Ahlawat J et al. – Enzyme and microbial technology (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/38147782/
Ichida K – Yakugaku zasshi : Journal of the Pharmaceutical Society of Japan (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/38825475/
Adamus JP et al. – Biomolecules (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/39062583/
Graham FJ et al. – European journal of heart failure (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/36823953/
Oskarsson A et al. – Food & nutrition research (2023). [Review]. https://pubmed.ncbi.nlm.nih.gov/38187804/
Kirk ML et al. – Journal of inorganic biochemistry (2022). [Review]. https://pubmed.ncbi.nlm.nih.gov/35932756/
Coelho FC et al. – International journal of molecular sciences (2022). [Review]. https://pubmed.ncbi.nlm.nih.gov/35887282/
Wang J et al. – Bioactive materials (2021). [Review]. https://pubmed.ncbi.nlm.nih.gov/33997503/
López-Alonso M et al. – Animals : an open access journal from MDPI (2020). [Review]. https://pubmed.ncbi.nlm.nih.gov/33076570/
Filler G et al. – Peritoneal dialysis international : journal of the International Society for Peritoneal Dialysis (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/31296778/
Kappler U et al. – Advances in microbial physiology (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/31655735/
Tejada-Jimenez M et al. – Molecules (Basel, Switzerland) (2018). [Review]. https://pubmed.ncbi.nlm.nih.gov/30545001/
Claerhout H et al. – Journal of inherited metabolic disease (2018). [Review]. https://pubmed.ncbi.nlm.nih.gov/28980090/
Kaufholdt D et al. – Frontiers in plant science (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/29184564/
EFSA Panel — NDA Opinion / NIH ODS Fact Sheet (2013/2024). [Regulatory / Reference]. EFSA Register / NIH ODS
Ichida K et al. – International journal of molecular sciences (2012). [Review]. https://pubmed.ncbi.nlm.nih.gov/23203137/
Mendel RR – BioFactors (Oxford, England) (2009). [Review]. https://pubmed.ncbi.nlm.nih.gov/19623604/
Mendel RR et al. – Biochimica et biophysica acta (2006). [Review]. https://pubmed.ncbi.nlm.nih.gov/16784786/
Yoshida M – Nihon rinsho. Japanese journal of clinical medicine (2004). [Review]. https://pubmed.ncbi.nlm.nih.gov/15658328/
Ichida K – Nihon rinsho. Japanese journal of clinical medicine (2003). [Review]. https://pubmed.ncbi.nlm.nih.gov/12629748/
Institute of Medicine - Dietary Reference Intakes (2001). [Expert Panel Review]. Trace Minerals
Vyskocil A & Viau C - Journal of Applied Toxicology (1999). [Toxicology Review]. https://pubmed.ncbi.nlm.nih.gov/10362269/
Kisker C et al. – Annual review of biochemistry (1997). [Review]. https://pubmed.ncbi.nlm.nih.gov/9242907/
Turnlund JR et al. - American Journal of Clinical Nutrition (1995). [Metabolic Balance Study]. https://pubmed.ncbi.nlm.nih.gov/7572711/
Rajagopalan KV - Annual Review of Nutrition (1988). [Comprehensive Review]. https://pubmed.ncbi.nlm.nih.gov/3060171/
27 studies — Molybdenum
NIH Office of Dietary Supplements - Molybdenum Fact Sheet (2024). [Government Review]. https://ods.od.nih.gov/factsheets/Molybdenum-HealthProfessional/
Xu J et al. – Sheng wu gong cheng xue bao = Chinese journal of biotechnology (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/39467736/
Ahlawat J et al. – Enzyme and microbial technology (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/38147782/
Ichida K – Yakugaku zasshi : Journal of the Pharmaceutical Society of Japan (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/38825475/
Adamus JP et al. – Biomolecules (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/39062583/
Graham FJ et al. – European journal of heart failure (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/36823953/
Oskarsson A et al. – Food & nutrition research (2023). [Review]. https://pubmed.ncbi.nlm.nih.gov/38187804/
Kirk ML et al. – Journal of inorganic biochemistry (2022). [Review]. https://pubmed.ncbi.nlm.nih.gov/35932756/
Coelho FC et al. – International journal of molecular sciences (2022). [Review]. https://pubmed.ncbi.nlm.nih.gov/35887282/
Wang J et al. – Bioactive materials (2021). [Review]. https://pubmed.ncbi.nlm.nih.gov/33997503/
López-Alonso M et al. – Animals : an open access journal from MDPI (2020). [Review]. https://pubmed.ncbi.nlm.nih.gov/33076570/
Filler G et al. – Peritoneal dialysis international : journal of the International Society for Peritoneal Dialysis (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/31296778/
Kappler U et al. – Advances in microbial physiology (2019). [Review]. https://pubmed.ncbi.nlm.nih.gov/31655735/
Tejada-Jimenez M et al. – Molecules (Basel, Switzerland) (2018). [Review]. https://pubmed.ncbi.nlm.nih.gov/30545001/
Claerhout H et al. – Journal of inherited metabolic disease (2018). [Review]. https://pubmed.ncbi.nlm.nih.gov/28980090/
Kaufholdt D et al. – Frontiers in plant science (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/29184564/
EFSA Panel — NDA Opinion / NIH ODS Fact Sheet (2013/2024). [Regulatory / Reference]. EFSA Register / NIH ODS
Ichida K et al. – International journal of molecular sciences (2012). [Review]. https://pubmed.ncbi.nlm.nih.gov/23203137/
Mendel RR – BioFactors (Oxford, England) (2009). [Review]. https://pubmed.ncbi.nlm.nih.gov/19623604/
Mendel RR et al. – Biochimica et biophysica acta (2006). [Review]. https://pubmed.ncbi.nlm.nih.gov/16784786/
Yoshida M – Nihon rinsho. Japanese journal of clinical medicine (2004). [Review]. https://pubmed.ncbi.nlm.nih.gov/15658328/
Ichida K – Nihon rinsho. Japanese journal of clinical medicine (2003). [Review]. https://pubmed.ncbi.nlm.nih.gov/12629748/
Institute of Medicine - Dietary Reference Intakes (2001). [Expert Panel Review]. Trace Minerals
Vyskocil A & Viau C - Journal of Applied Toxicology (1999). [Toxicology Review]. https://pubmed.ncbi.nlm.nih.gov/10362269/
Kisker C et al. – Annual review of biochemistry (1997). [Review]. https://pubmed.ncbi.nlm.nih.gov/9242907/
Turnlund JR et al. - American Journal of Clinical Nutrition (1995). [Metabolic Balance Study]. https://pubmed.ncbi.nlm.nih.gov/7572711/
Rajagopalan KV - Annual Review of Nutrition (1988). [Comprehensive Review]. https://pubmed.ncbi.nlm.nih.gov/3060171/
The Benefits of Iodine
Bioavailable Form
We use Potassium Iodine, a stable and well-absorbed form of iodine, this is an essential mineral for normal thyroid function and hormone production.
Key Highlights
- Essential for normal thyroid function (EFSA approved)
- Contributes to normal cognitive function
- Supports normal energy-yielding metabolism
- Important during pregnancy for fetal development
Biochemistry Timeline
Iodine is rapidly absorbed in the stomach and upper small intestine. Your thyroid gland actively concentrates iodine to produce thyroid hormones T3 and T4, which regulate metabolism throughout the body. While iodine absorption happens quickly, the downstream effects on thyroid function and energy levels develop over weeks as hormone levels stabilize.
Summary
Iodine is essential for thyroid hormone production, which in turn influences nearly every cell in your body. In Nordic regions, where iodine-rich seafood may not be a daily staple, maintaining adequate intake is particularly relevant. Iodine contributes to normal cognitive function, energy metabolism, and healthy skin.
FAQs
How common is iodine deficiency?
Iodine deficiency remains a concern in parts of Europe, including some Scandinavian populations. Denmark introduced iodine fortification of salt in 2000, which has improved population iodine status, but some individuals may still benefit from ensuring adequate intake.
Can I get enough iodine from food alone?
Good dietary sources include fish, shellfish, dairy products, eggs, and iodized salt. Seaweed is also rich in iodine but varies widely in content. If your diet is limited in these foods, supplementation may be helpful.
Is it possible to take too much iodine?
Yes, excessive iodine can paradoxically impair thyroid function. The European tolerable upper intake level for adults is 600 micrograms per day. Most supplements provide amounts well within safe limits.
Research
Zugravu CA et al. – Geriatrics (Basel, Switzerland) (2026). [Review]. https://pubmed.ncbi.nlm.nih.gov/41718360/
Adugna YM et al. – BMC public health (2026). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/41527070/
Mazur M et al. – Pathophysiology : the official journal of the International Society for Pathophysiology (2025). [Review]. https://pubmed.ncbi.nlm.nih.gov/40843807/
Favara G et al. – Nutrients (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/39796495/
Gierach M et al. – Endokrynologia Polska (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/38923898/
Huang S et al. – Antioxidants (Basel, Switzerland) (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/39061936/
Liu L et al. – Frontiers in nutrition (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/38757132/
Sohn SY et al. – Endocrine reviews (2024). [Review]. https://pubmed.ncbi.nlm.nih.gov/38870258/
Baffa LD et al. – Systematic reviews (2024). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/38816755/
Choudhury A et al. – Expert review of gastroenterology & hepatology (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/37060552/
Garofalo V et al. – Nutrients (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/38004184/
Osowiecka K et al. – Nutrients (2023). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/36839399/
Wróblewski M et al. – International journal of molecular sciences (2023). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/36902266/
Jalal CS et al. – The Cochrane database of systematic reviews (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/37665781/
Dijck-Brouwer DAJ et al. – Nutrients (2022). [Review]. https://pubmed.ncbi.nlm.nih.gov/36235539/
Wassie MM et al. – Biological trace element research (2022). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/33686634/
Jfri A et al. – JAMA dermatology (2021). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/34037678/
Bartalena L et al. – European journal of endocrinology (2021). [Study]. https://pubmed.ncbi.nlm.nih.gov/34297684/
Nazeri P et al. – European journal of endocrinology (2021). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/33112293/
Dineva et al. — Eur J Nutr (2020). [Prospective cohort].
Dineva M et al. – The American journal of clinical nutrition (2020). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/32320029/
European iodine status — regional (2020). [Epidemiological].
Norwegian pregnant women - mild ID (2019). [Validation (n=137)]. https://pubmed.ncbi.nlm.nih.gov/31665021/
Swedish national - pregnant ID (2019). [National cross-sectional]. https://pubmed.ncbi.nlm.nih.gov/31616973/
van Dyk N et al. – British journal of sports medicine (2019). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/30808663/
Santos JAR et al. – The Cochrane database of systematic reviews (2019). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/30746700/
Drover SSM et al. – Epidemiology (Cambridge, Mass.) (2019). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/30299402/
Taylor PN et al. - The Lancet Diabetes & Endocrinology (2018). [Review]. https://pubmed.ncbi.nlm.nih.gov/30075974/
Mansel RE et al. – Journal of women's health (2002) (2018). [RCT]. https://pubmed.ncbi.nlm.nih.gov/29237134/
Harding et al. — Nutrients (2017). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/28282852/
Harding KB et al. - Cochrane Database of Systematic Reviews (2017). [Cochrane Review]. https://pubmed.ncbi.nlm.nih.gov/28280756/
Al Attar WSA et al. – Sports medicine (Auckland, N.Z.) (2017). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/27752982/
Liontiris MI et al. – Hellenic journal of nuclear medicine (2017). [Review]. https://pubmed.ncbi.nlm.nih.gov/28315909/
Abel MH et al. — Nutrients (2017). [Cohort study]. https://pubmed.ncbi.nlm.nih.gov/28788060/
Leung & Braverman — Lancet Diabetes Endocrinol (2014). [Review]. https://pubmed.ncbi.nlm.nih.gov/24966614/
EFSA NDA Panel — EFSA Journal (2014). [Regulatory / Scientific Opinion]. Regulatory / Foundational
Taylor PN et al. – European journal of endocrinology (2014). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/24088547/
Vargas-Uricoechea H et al. – Clinica e investigacion en arteriosclerosis : publicacion oficial de la Sociedad Espanola de Arteriosclerosis (2014). [Review]. https://pubmed.ncbi.nlm.nih.gov/25438971/
Vargas-Uricoechea H et al. – Hormone molecular biology and clinical investigation (2014). [Review]. https://pubmed.ncbi.nlm.nih.gov/25389997/
Leung AM & Braverman LE — Curr Opin Endocrinol Diabetes Obes (2014). [Review]. https://pubmed.ncbi.nlm.nih.gov/25122491/
Belgium pregnancy thyroid (national) (2013). [National survey (55 clinics)]. https://academic.oup.com/jcem/article/98/9/3694/2833171
Bath et al. — Lancet (2013). [Prospective cohort (ALSPAC)]. https://pubmed.ncbi.nlm.nih.gov/23706172/
Bath SC et al. - The Lancet (2013). [Prospective Cohort]. https://pubmed.ncbi.nlm.nih.gov/23706172/
Pearce EN et al. - Nature Reviews Endocrinology (2013). [Expert Review]. https://pubmed.ncbi.nlm.nih.gov/23999897/
Zhou SJ et al. – The American journal of clinical nutrition (2013). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/24025628/
Bath SC et al. — Lancet (2013). [Cohort study]. https://pubmed.ncbi.nlm.nih.gov/23706770/
Pearce EN et al. — Eur Thyroid J (2013). [Cross-sectional]. https://pubmed.ncbi.nlm.nih.gov/24783049/
Trumpff C et al. — Neurotoxicology (2013). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/23792350/
Laurberg et al. — Eur J Endocrinol (2010). [Review]. https://pubmed.ncbi.nlm.nih.gov/20139279/
Zimmermann — Endocr Rev (2009). [Comprehensive review]. https://pubmed.ncbi.nlm.nih.gov/19482711/
Zimmermann MB - Endocrine Reviews (2009). [Comprehensive Review]. https://pubmed.ncbi.nlm.nih.gov/19179428/
Köhrle J et al. – Best practice & research. Clinical endocrinology & metabolism (2009). [Review]. https://pubmed.ncbi.nlm.nih.gov/19942156/
Zimmermann MB — Endocr Rev (2009). [Review]. https://pubmed.ncbi.nlm.nih.gov/19190108/
Ursella S et al. – European review for medical and pharmacological sciences (2006). [Review]. https://pubmed.ncbi.nlm.nih.gov/17121321/
Ohara N et al. – Journal of obstetrics and gynaecology Canada : JOGC = Journal d'obstetrique et gynecologie du Canada : JOGC (2004). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/15560861/
Smyth PP – Breast cancer research : BCR (2003). [Review]. https://pubmed.ncbi.nlm.nih.gov/12927031/
Delange F – Postgraduate medical journal (2001). [Review]. https://pubmed.ncbi.nlm.nih.gov/11264481/
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Martino E et al. – Endocrine reviews (2001). [Review]. https://pubmed.ncbi.nlm.nih.gov/11294826/
Markou K et al. – Thyroid : official journal of the American Thyroid Association (2001). [Review]. https://pubmed.ncbi.nlm.nih.gov/11396709/
Loh KC – Postgraduate medical journal (2000). [Review]. https://pubmed.ncbi.nlm.nih.gov/10684321/
Miniero R et al. – Annali dell'Istituto superiore di sanita (1998). [Review]. https://pubmed.ncbi.nlm.nih.gov/10052173/
ETA/Endocrine Society pregnancy guidelines (Current). [Clinical guidelines]. https://emedicine.medscape.com/article/122714-guidelines
Iodine thyroid mechanism — established (Established). [Established science].
64 studies — Iodine
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Wróblewski M et al. – International journal of molecular sciences (2023). [Systematic review]. https://pubmed.ncbi.nlm.nih.gov/36902266/
Jalal CS et al. – The Cochrane database of systematic reviews (2023). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/37665781/
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Taylor PN et al. - The Lancet Diabetes & Endocrinology (2018). [Review]. https://pubmed.ncbi.nlm.nih.gov/30075974/
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Zimmermann — Endocr Rev (2009). [Comprehensive review]. https://pubmed.ncbi.nlm.nih.gov/19482711/
Zimmermann MB - Endocrine Reviews (2009). [Comprehensive Review]. https://pubmed.ncbi.nlm.nih.gov/19179428/
Köhrle J et al. – Best practice & research. Clinical endocrinology & metabolism (2009). [Review]. https://pubmed.ncbi.nlm.nih.gov/19942156/
Zimmermann MB — Endocr Rev (2009). [Review]. https://pubmed.ncbi.nlm.nih.gov/19190108/
Ursella S et al. – European review for medical and pharmacological sciences (2006). [Review]. https://pubmed.ncbi.nlm.nih.gov/17121321/
Ohara N et al. – Journal of obstetrics and gynaecology Canada : JOGC = Journal d'obstetrique et gynecologie du Canada : JOGC (2004). [Meta-analysis]. https://pubmed.ncbi.nlm.nih.gov/15560861/
Smyth PP – Breast cancer research : BCR (2003). [Review]. https://pubmed.ncbi.nlm.nih.gov/12927031/
Delange F – Postgraduate medical journal (2001). [Review]. https://pubmed.ncbi.nlm.nih.gov/11264481/
Bogazzi F et al. – Thyroid : official journal of the American Thyroid Association (2001). [Review]. https://pubmed.ncbi.nlm.nih.gov/11396710/
Martino E et al. – Endocrine reviews (2001). [Review]. https://pubmed.ncbi.nlm.nih.gov/11294826/
Markou K et al. – Thyroid : official journal of the American Thyroid Association (2001). [Review]. https://pubmed.ncbi.nlm.nih.gov/11396709/
Loh KC – Postgraduate medical journal (2000). [Review]. https://pubmed.ncbi.nlm.nih.gov/10684321/
Miniero R et al. – Annali dell'Istituto superiore di sanita (1998). [Review]. https://pubmed.ncbi.nlm.nih.gov/10052173/
ETA/Endocrine Society pregnancy guidelines (Current). [Clinical guidelines]. https://emedicine.medscape.com/article/122714-guidelines
Iodine thyroid mechanism — established (Established). [Established science].
Sustainably delivered and refilled, monthly.
Personalized Plan
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Pouches OnlyNo new tube each time -
Fully CompostableBreaks down completely
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All PaperNothing to sort
Glass Bottles
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Refill BagsFits into your day
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Less PackagingLighter every reorder
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Glass Built to LastReuse for years
Try it for 90 days completely risk-free.
Formulated without gluten, dairy, corn and common allergens.
Manufactured to the highest standards with GMP, ISO22000, HACCP.
Continuously tested and approved by Fødevarestyrelsen.
Questions?
We're here to help.
Our multivitamin supports immune function, energy metabolism, bone health, and cognitive balance, especially helpful for those following a plant-based diet. It covers all key vitamins and minerals your body needs daily
If you’re unsure, you can use our free online health assessment. It’s quick, personalised, and can suggest which supplements match your needs, no subscription required. Just click the “Take Test Now” button at the top of the page.
Take two tablets daily with a main meal and water, morning or lunchtime often works best. This helps with absorption and makes it easier to remember.
Yes, it can often be combined with other supplements, depending on your needs. If you're unsure, you can take our free health assessment on the website, it gives you personalised suggestions in minutes, with no subscription required. Just click “Take Test Now” at the top of the page.
We recommend taking your two tablets with a main meal and water for better absorption and a gentler experience on the stomach. Taking it on an empty stomach may cause discomfort for some.
This supplement is not specifically formulated for pregnancy or breastfeeding. Please consult your doctor or midwife for recommendations tailored to your needs.
Yes, this multivitamin is safe for long-term use when taken as directed. It's designed to support daily wellness over time, but always consult your doctor for personalised guidance.
Most people tolerate this formula very well. If you experience any unexpected effects, we recommend pausing use and speaking with a healthcare provider.
If you're taking medication or have any medical conditions, it's best to speak with your doctor before starting a multivitamin. This helps ensure the nutrients align safely with your treatment plan.
A healthy diet is always the foundation, but it’s not always easy to get the full range of essential vitamins and minerals every day, especially B12 and D3 in plant-based diets. This supplement helps fill in the nutritional gaps reliably.
Many users begin to notice subtle improvements in energy, focus, and general wellbeing within a few weeks. Some benefits, like nutrient rebalancing, may take longer and depend on your current levels and lifestyle.
Yes, the daily dose is two tablets, which can be taken together with a meal and water. It’s designed to be simple and easy to fit into your day.
Simply continue with your usual routine the next day, there’s no need to double up. Consistency over time is what helps the most.
This formula is developed for adults and is not recommended for children. Older adults can benefit from it, but we suggest consulting a healthcare provider for individual advice.
Although we take care to avoid cross-contamination, this product is made in a facility that also handles allergen-based ingredients. Please review the full ingredient list if you have sensitivities.
Our Vitamins are manufactured in the UK under strict GMP (Good Manufacturing Practice) standards. It’s then handled and packed in Denmark with full traceability. Each batch undergoes rigorous quality and safety checks to ensure purity, potency, and consistency , so you always know you're getting exactly what’s on the label.
Yes, this product is 100% vegan and made without any animal-derived ingredients. It’s also free from gelatin and dairy.
Every 30 days we prepare a fresh delivery of your personalized supplements. Your first order arrives in a reusable dispenser box, and every refill after that comes in a biodegradable pouch that slots straight into your dispenser. There's no lock-in, so you can pause, skip, or cancel anytime from your account.
Subscribers save 16% on every delivery, applied automatically. No setup fees, no hidden charges. The discount stays the same as long as your subscription is active.
Yes. You can pause, skip, or cancel anytime from your account dashboard with no minimum commitment and no cancellation fee. If you pause or skip, your next delivery simply waits until you're ready to resume.
Your payment method is charged 3 to 5 days before your next scheduled dispatch date, so your shipment arrives before your current supply runs out. You can view the exact date anytime by logging into your account.
Your first order includes the reusable dispenser box plus your personalized daily supplement pouches. Every refill after that comes in biodegradable pouches that slot straight into your existing dispenser, so you're only replacing what needs replacing.
Our free 3-minute health quiz asks about your body, lifestyle, diet, goals, and any health concerns. The algorithm then matches you to the nutrients your body is most likely to need, drawing on peer-reviewed research and EFSA-approved evidence. No guesswork, no one-size-fits-all.
Yes. You can retake the quiz anytime to refresh your recommendation, or add, swap, or remove individual supplements from your account dashboard. Your plan evolves with you.
Our supplements are formulated to EU safety standards and produced in certified facilities. The quiz screens for interactions with anything you're already taking and flags potential conflicts. For specific medical conditions or prescription drugs, we always recommend checking with your doctor before starting.
Orders are dispatched within 1 to 3 business days of payment. Delivery typically takes another 2 to 10 business days depending on your location and chosen carrier. Once your order ships, you'll receive a tracking link by email so you can follow it the whole way.
We currently ship to Denmark, Scandinavia, and select European countries. Available delivery areas are shown at checkout. If your country isn't listed, email support@persona-path.com and we'll see what's possible.
First-time customers are covered by our 30-day money-back guarantee. If you're not fully satisfied with your first purchase, email support@persona-path.com within 30 days and we'll refund you in full. You don't need to return the supplements, and refunds are processed to your original payment method within 5 business days of approval.
Yes. In addition to our 30-day guarantee, EU law gives you a 14-day right of withdrawal from the day you receive your order. Email support@persona-path.com within 14 days and we'll refund the full purchase price, including standard delivery, within 14 days of your request.
Email support@persona-path.com within 7 days with your order number and a photo of the issue. We'll arrange a free replacement or issue a full refund for the affected product. We cover all costs in these cases.
Yes. Your quiz answers are processed under GDPR with your explicit consent and used only to generate your personalized plan. We never sell your data or share it with advertising platforms. You can request deletion at any time. Full details in our privacy policy.
Our quiz screens for pregnancy, breastfeeding, and major health conditions, and the algorithm adjusts your recommendations accordingly. We're not a substitute for medical advice, so please check with your doctor before starting any new supplement if you're pregnant, breastfeeding, or managing a health condition.